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 bolts that mean business!

COMPLETE 4 PACK KIT - Everything you need to fix or replace two toilet seats, making your bathroom feel fresh and reliable.
ROCK SOLID STABILITY - Say goodbye to wobbly toilet seats with secure expanding rubber bungs that lock tight every time.
TOOL FREE BOTTOM ACCESS - Top screw installation means no awkward under-toilet tightening—easy upgrade for busy professionals.
RUST RESISTANT DURABILITY - Brass nuts and plastic washers resist corrosion, keeping your bathroom hardware pristine and maintenance-free.
PRECISION FIT FOR TOP FIX SEATS - Designed specifically for 14-16mm hole diameters, ensuring a perfect, no-fuss installation.

The SelfTek 4 Pack Toilet Seat Bolts kit offers a professional-grade solution for securing toilet seats with 14-16mm holes. Featuring expanding rubber bungs for a tight fit, rust-resistant brass nuts, and plastic washers, this kit ensures a wobble-free, durable installation without the hassle of bottom access tightening. Ideal for quick, reliable bathroom upgrades.

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Fastener type	Bolt, Push, Round
Head style	Round
Finish type	Ceramic
Shape	Rectangular
Number of pieces	4
Compatible groove diameter	0.55 Inches
Manufacturer	SelfTek
UPC	799355410915
Part number	SelfTek/397PHHO
Item Weight	36.3 g
Product Dimensions	4 x 1 x 0.1 cm; 36.29 g
Manufacturer reference	SelfTek/397PHHO
Color	Silver, White, Black
Style	Rubber+Steel-4 Pack
Finish	Ceramic
Item Package Quantity	1
Head Style	Round
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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