Where is the lot number on a two-wheel wheelbarrow, and which page do you order the replacement part from? On a Gorilla GPX-8D, the lot number is on the black label on the bottom of the rear leg, and the parts for your machine are listed at the bottom of that model's own product page. Everything below stays inside that scope: identifying a GPX-8D and using Gorilla's own service answers.
The lot number is what narrows a machine down to the right replacement part. The model name gets you to the correct product page. On this barrow there is a second narrowing step, and plenty of owners skip it: the quick change wheel system means the machine in your shed may not be sitting in the configuration it shipped in.
The Lot Number Sits Under the Rear Leg
Gorilla's answer is one sentence: the lot number can be found on the black label on the bottom of the rear leg. Read it again with the barrow in front of you. The label faces the ground. Someone who walks past the machine, or who reads the stickers on the tub and the frame, is looking at the wrong surface entirely. That is how a barrow with a lot number on it becomes a barrow that "never had one."
The label is underneath, not on top.
Get a clear line of sight to the underside of the rear leg. Daylight helps; a phone flashlight held low pulls the label edge out of the shadow. You do not need to read the number from standing height, and you cannot.
Get the black label and the model name into one photo. One frame carries both identifiers, so when you call the dealer or write to the manufacturer you are not spending the opening of the call establishing which machine you own. Without the photo, you describe the barrow from memory on the phone, which is where wrong parts get ordered.
Replacement Parts Live at the Bottom of the Product Page
There is no site-wide parts bin to browse. Replacement parts can be found and ordered on each individual product page: look up your existing product, then see what parts are available at the bottom of that page.
The common mistake is starting from the wrong end, with a general listing or a part that looks the same. The part shows up and it is simply not on the list for that machine, so now you are holding a real box and comparing it against a page you never opened. Start with your model's page, scroll to the bottom, read the list there, order from that list.
Worth being clear about what that answer does and does not give you. It tells you where parts are listed and how they are ordered. It is not a fitment chart, and it does not promise that everything listed on a page matches every build of that model. If your question is "will this one fit mine," you have not answered it yet.
Dual or Single Wheel Decides Which Parts Fit
The GPX-8D uses a quick change wheel system that converts from a dual wheel to a single wheel. Follow that through. A barrow sold as a two-wheeler may be running on one wheel today, because someone converted it for a season and never converted it back. The machine did not change its name when that happened.
The mistake is treating "2 wheel" as a permanent description of your machine and ordering wheel-side parts from memory. The page is right, the model is right, and the part still does not match the barrow standing in front of you. Suppose you switched to a single wheel last season to squeeze between beds, then ordered a wheel-side part this spring without walking out to look. That is exactly how a correct order goes wrong.
So check the current state before you order, then go back to the model's product page and match the part against what is actually on the machine. This reasoning holds for the GPX-8D. It does not transfer to other models without their own documentation saying so.
A Skeptic Asks Why the Model Name Isn't Enough
A skeptic would say the model name is printed right there on the machine, so what does a lot number add? Fair question, and the answer is a division of labor rather than a substitution. The model name takes you to the page where that list lives. The lot number separates one build of that model from another.
The mistake is treating the two as alternatives and picking one. You land on the correct page, you cannot say which version of the machine you own, and the conversation with the dealer stalls at the one question that decides the part.
Two identifiers do two separate jobs.
Keep the scope honest, too. Gorilla's FAQ says where the label is. It does not say the lot number is mandatory for a warranty claim, and nothing here claims that. You are collecting it because it identifies your machine, not because a form demands it.
What These Three Answers Still Don't Cover
Three answers will not cover everything you want before you click order. There is no independent comparison test behind any of this, no pricing, no fitment table mapping a lot number to a specific part number, no installation steps or torque figures, and no statement about any model other than the GPX-8D. Those are gaps, not details to be filled in by guessing.
A skeptic would say the official answers are enough. They are enough to locate the label and to find the parts page. They are not enough to pin down a part. Treating them as a fitment specification is the mistake here, and the cost is a box that arrives and matches neither your build nor your current wheel setup.
Send the lot-number photo, the model name, and your current dual-or-single setup to the manufacturer or your dealer, and ask the fitment question directly. That is a short message, and it puts the answer on someone who has the build records instead of on your memory of what the barrow looked like last year.
Go out to the machine today and get low enough to see the underside of the rear leg. Photograph the black label and the model name in one frame, open the GPX-8D product page, scroll to the bottom, note whether the barrow is running dual or single right now, and order against what you see rather than what you remember. If the page leaves the fitment question open, send the photo and ask before you buy.
