Vitromex Toilet - Flush Valve Gasket replacement.

[TerryM01]

Hello, I have 17 year old house with the original contractor spec'd toilets...Vitromex 6 LPF is what is says inside of the Tank.
I am replacing the guts of one of the toilets and choose Korky universal replacement parts 0 Flill and Flush Valves.
The Korky Flush Valve Tank to toilet Gasket is to large and will not allow the tank to sit properly on the toilet...to large of a gap and consequently the tank will rock back and forth....I set the 2 bolts and washers and checked and then verified gap against my other 2 toilets.

I'm attaching pictures of everything (oringlan Flush Valve, both sponge gaskets and tank and bowl.
I've looked at Homedepot and Lowes and on line (plumbersupply.com and others) and can not find the correct gasket that will fit.
The original gasket is compressed and deteriorating but here are the measurements I took form it.
The original gasket has a space for the flush valve mounting nut as does the Korky replacement

Outside diameter Approx 3-1/2 inches
Inside Diameter 2-7/8 inches
Inside lip height (from bottom of gasket to the nut lip - my term) Approx 3/8 inches
Shoulder height: Aprox 9/15
Height of gasket - Aprox 1 inch or 15/16.

I would appreciate any help with identifying the correct replacemetn gasket or if I need to use a different brand of Flush Valve...
Thank you - Terry

 

[32Lv41]

Terry, I have the same problem. I am considering putting toilet to floor shims in under the tank for support. I can't find a correct size gasket either.

 

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[Peterson]

I would try to reuse the old flush valve (if it's not damaged), and then set the tank using the red gasket. It looks like the flush valve could be too big?