Picture is of a kohler rialto
looks like you can get the parts or retro fit newer kohler flush parts
ring around for a plumber or kohler toilets seller that can supply kohler cystern parts
SOURCE: PLUMBSHOP HUSHFLO #516 Toilet anti-siphon/valve
Usually, there is a diaphram located at the needle valve that can be removed and cleaned and or replaced. If you know you have grit in the water, then you are right, that will cause problems with the fill valve not fully closing.
SOURCE: Running toilet
You need to replace the float system. This will fix the problem will take you about 15 minutes and will cost you about 15 dollars to due it yourself. This is not the flapper, rather this is the float and the water inlet system
SOURCE: can't change the toilet seat that broke
Kohler Rialto Toilet seat replacement.
Use dremel to cut off old bolt and allow it to fall into the black abyss that is the genius of Kohler engineering. Enlarge the hole to 3/8. I worked up to that size slowly increasing bit size so as not to crack porcelin. At Home Depot I bought a 1/4 x 20 x20mm "Insert Nut" and a good 2 part epoxy meant for metal and ceramic. Gently tap the Insert nut about 1/2 way into the hole and apply epoxy all the way around. Continue tapping the insert nut until it is flush. Clean off excess epoxy and allow to set. Now attach any standard round toilet seat using the standard 1/4 nut that comes with it. I used a Kohler "Cachet" round toilet seat to replace the Kohler "French Curve" that comes standard with the Rialto. All in all it should take you about 1/2 hour.
Happy Fixing!
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