The quote names one product. The crew arrives with another. Often the swap is a close cousin: the same job, a different model number, a finish that matches the bathroom better, or whatever was on the truck. Nobody has to mean harm for this to happen. But the warranty, the load rating and the sign-off were written for the product on the quote, so the substitute stands outside all three until you check it.
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Find the line the paper names
Start with the quote or contract and find the line for each item at your stops. Write down the model number exactly as printed, along with the finish, the length and how the item mounts. If the paper says only grab bar or toilet frame, ask the seller to add the model number in writing before anything is ordered. A vague line lets any part count as the part.
Read the box and the label on the part
When the delivery comes, check the model number on the box and on the product itself against the quoted line before the crew starts drilling. Look for the load rating printed on the product or in the manufacturer's instructions. Do not estimate it from how solid the item feels. If you cannot find a rating anywhere, ask the seller for the manufacturer's document and keep it with the quote.
Ask the swap question out loud and on paper
Say it plainly: Is this the quoted model? If not, what is it, does it carry its own warranty, and who stands behind it? Then ask for the answer in writing, on the change line or in an email you can keep. A verbal yes is not a record. If the answer is that the warranty is the same, get the manufacturer's or installer's name on that statement, not only the salesperson's.
Walk each stop against the paper
Go through your six stops in order, from the bed to the toilet. At each stop, match the item in place to its line on the paper. Some stops will have nothing to match, and that is worth writing down too, so an empty stop is not mistaken for a missed one. Check that the mounting hardware is the hardware the install called for, and that no fastener was swapped for a shorter one without a note.
Write down what you signed and what you accepted
Keep one page with four columns: the quoted model, the delivered model, the warranty that applies to each, and the name and phone number of the person who approved any change. Put the signed sign-off page behind it. If a substitute was accepted, write down the reason in the seller's words, not your own.
If the swap is refused
If the crew cannot supply the quoted model, do not accept the substitute just because it is already on the truck. Ask for the quoted model to be ordered, or ask for a revised quote that names the substitute, its rating and its warranty. Keep the original quote next to the revision. Until the paper matches the wall, treat that stop as unfinished.
The paper should describe the thing you can actually hold. If it does not, the warranty and the rating are describing a different part. For local help reading the paperwork and finding who to call, see Local help after a fall, St. Louis.