I think those mounts are specific to the Lobo and Recoil Proof scopes that TC used to sell. Good little scopes imho, but sometimes hard to find. Like this one.
https://www.ebay.com/itm/thompson-c...2349624.m46890.l49286&mkrid=711-127632-2357-0
The Ironsighter is View attachment 18980
View attachment 18983
The offset mount from TC is one of these.View attachment 18981
The QR setup isView attachment 18982
Not sure if that setup will work. My rifle is a pre-91 and does not have the extra hole in the front of the tang.