Keystoker 105 Ash Door Gasket Size?

Do any of you fine folks happen to know the door gasket size on a Keystoker 105 ash door? It may be the same size on both doors, but the other is not an issue right now. I did a fair bit of searching for the answer before asking. I have also thought about just trying to "cement" it back in place with RTV or something. Any opinion on that? How does one know that it needs replacing, other than the fact that it does not seal to the stove?

As always, thanks for your collective wisdom! It has kept the oilman at bay for years now...

Rick

Keystoker 90 uses 3/4 round, same doors. I used Imperial Gasket cement from True Value, nice stuff clear glue easy to use unlike the cement base stuff of the past I used. Just be careful not to stretch it when installing. Glass gasket is 1/2 flat.

Good information, thanks very much!

Rick