What gasket material between woodburner and boot adapter

[doublejz]

I finally got around to getting a boot adapter for an old Squire and ready to put it in the fireplace. However, what kind of gasket should I be using between the wood burner and the boot adapter? It appears that rope gasket material will be too thick. I did find some ceramic fiber blankets about 1/2 thick that have a max temp rating of 2300* F.

I also thought about just slapping on a bunch of furnace cement and tightening the boot adapter down. I mean once its pulled down tight with the clamps it shouldn't move any to crack/break the cement.

Anyway, any help would be appreciated.

 

[begreen]

This may not be large enough unless pieced, but it looks like something like this should work for making a gasket. To ease installation it could be tacked in place with an adhesive until the clamps can compress it.
https://www.amazon.com/dp/B072BTHHNH/?tag=hearthamazon-20

or maybe this would work better? It's 1/4" thick.
https://www.amazon.com/dp/B0777LCS3Y/?tag=hearthamazon-20

or
https://www.amazon.com/dp/B01NANV31B/?tag=hearthamazon-20