does this fit kohler?

I’ve installed this on two Kohler toilets. But it wasn’t easy. The hole in the toilet body is small. So you can’t push the rubber part down through the top. But you can push the top of the rubber fitting up from underneath - with some effort and squishing of the rubber top flange to force it in the hole. Once seated, however, it fits well and it seems to holding everything nicely.

Does this not use the wing nut on the bottom of the toilet hole?

The rubber part has a threaded insert. When you tighten the top the rubber is expanded in the hole of the toilet to hold it in place. These worked well for my toilet seat, which wanted to always move from side to side.

Is it possible to use longer bolts with this in order to accommodate a luxe bidet and a handrail attachment? Might need extra length..

Yes you could but you don't need to. As long as the rubber part fits in the hole... all the bolt does is squeeze the rubber to make it expand inside the porcelain. It's a compression fitting.

Mine are not holding the lid into place. Am I supposed to keep tightening?

This is an expansion bolt, and can only expand to a certain point. If your hole diameter is > the fully tightened up bolt, then you will need a bolt with a greater diameter. So yes, keep turning the screw insuring that the entire black rubber expansion in not rotating while turning the screw

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🚽 Upgrade your throne with zero wobble, zero hassle!

COMPLETE 4 PACK KIT - Everything you need to upgrade your toilet seat hardware in one convenient set.
ROCK SOLID STABILITY - Say goodbye to wobbly toilet seats with secure 14-16mm hole fit and anti-slip rubber grips.
PERFECT FIT PRECISION - Designed for 28mm diameter seat covers for a snug, professional finish.
RUSTPROOF RELIABILITY - Stainless steel screws and brass nuts ensure long-lasting corrosion resistance.
EFFORTLESS INSTALLATION - Top-fix design with flexible rubber bungs means no bottom tightening hassle.

The SelfTek 4 Pack Toilet Seat Bolts kit features rust-resistant stainless steel screws encased in anti-slip rubber expansion nuts, designed for 14-16mm hole toilet seats with 28mm diameter covers. This easy-to-install, top-fix hardware replacement ensures a stable, wobble-free seat with a professional finish, making it the ultimate upgrade for your bathroom essentials.

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Fastener Type	Bolt, Push, Round
Head Style	Round
Finish Type	Rubber
Shape	Round
Item Diameter	0.67 Inches
Thread Size	M6
Number of Pieces	4
Compatible groove diameter	0.55 Inches
Manufacturer	SelfTek
UPC	799355410915
Part Number	SelfTek/397PHHO
Item Weight	1.28 ounces
Is Discontinued By Manufacturer	No
Style	Rubber+Steel-4 Pack
Finish	Rubber
Item Package Quantity	1
Cutting Diameter	0.67 Inches
Batteries Included?	No
Batteries Required?	No

SelfTek 4 Pack Toilet Seat Bolts, Hinge Bolt Screws Toilet Seat Fixings Fix Expanding Rubber Top Nuts Screws Mount Seat Hardware Replacement Parts Kit (for 14-16mm hole toilet seats)

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