Toilet Tank to Bowl Gasket Replacement and Sizing (how exact?)

[sametime]

Toilet is a Crane Galaxy/Cranada (? No idea the actual model) judging by a picture guide and is around 12 years old.

https://www.plumbingsupply.com/cranetoiletparts-galaxy-cranada.html

I'm in the process of replacing the toilet tank bolts as one of the heads has snapped off. (As an aside, what's the pros/cons to using a Wing Nut vs. Hex Nut at the bottom of the bolt against the toilet bowl?)

I'm wondering if I should also replace the tank to bowl gasket at the same time?

If so I'm also having some difficulties understanding the sizing. The above site lists the following measurements - 3-1/2" O.D. x 2" I.D. x 1-1/8" high

but it doesn't correspond at all to the measurements I'm taking. Although I don't know how much that has to do with the gasket having been squeezed and compressed.

I'm measuring 9.7cm (3 13/16 inches) O.D , 5.7cm (2 1/4 inch) I.D , 2.2 cm ( 55/64 inches) high (only have a Canadian metric ruler, doing the conversion manually). This is with the gasket not removed and still on the tank however.

The Korky Universal Kit seems to be - 2-1/8 inch inner diameter, 3-1/2 inch outer diameter and 1-1/4 inch thick
The Fluidmaster one doesn't seem to list the measurements.

While I've also found this which says it's for Crane toilets - https://www.lowes.ca/product/toilet...kit-bolts-and-gasket-for-crane-toilets-191521

which has the following measurements -

• 3-3/16-in x 2-1/8-in x 1-3/16-in sponge rubber gasket

Along with many other options. None of which have less than 1 inch thickness or as large a O.D. as I measured. Most seem to have 2 1/8in I.D. as well. Are you supposed to under size the O.D/I.D and over size the thickness due to compression of the material?

 

[Terry]

The crane 2" flush valve should take just the regular off the shelf tank gasket.
Wing nuts are fine to hold the tank to the bowl.

 

[Sponsor]

 

[sametime]

The crane 2" flush valve should take just the regular off the shelf tank gasket.
Wing nuts are fine to hold the tank to the bowl.

Thanks.

So the off the shelf Fluidmaster should work? I was thinking of just buying the kit with the gasket and bolts (since it comes with brass bolts I believe).

https://www.homedepot.ca/product/fluidmaster-toilet-tank-to-toilet-bowl-repair-kit/1000661846

The Korky kit apparently needs weeks to ship, but it comes with stain less steel bolts. Not sure if either is better over the other in terms of rust prevention?

https://www.homedepot.ca/product/korky-tank-to-bowl-gasket-and-hardware-standard-2-inch/1001141574

Any benefit to wing nuts or is it just ease of installation?

If everything goes well I'll pre-emptively change out the other toilet as well, since those also have huge globs off rust built over top.