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My Gerber toilet has a # K-95-91-1 stamped on the inside and the toilet tank cover measures 20& 1/2 long and 9" reducing to 8 &1/2 inches width. I far as I can tell it looks exactly like your photo 28-299 or W6 or W5. Will this cover fit my toilet? Thank you.
Gerber's markings can be vague, ambiguous or absent. Start off by looking at the two common models. We distinguish them as "Rounded corners" and "Angeled corners." If one of them matches your shape, then compare the dimensions. Our dimensions are the bottom outside edges at the greatest points. If the dimensions match within 1/8", you have confirmed the correct model. If you do not have a match, move over to email and send us photos or your lid. Caution: Broken tanks lids are sharp and dangerous.