I think the Saunders Red guts will fit into your TT. You can hit Cabelas or SW and see if they have any guts for sale from other makers as well. I think I have about 10 different sets of guts, KOD, Hammock, Saunders, GK Edge, Knight and Hale, Victoria Honker, Winglock, Hess. There are as many different "reeds" as there are guts. Tinkering with different combinations can be a challenge. Then there is bend of the reed in or out, Shave or sand. I know I have a set of green Zink guts in one of my TT that Joe Hanson tweaked for me, nice sounding call.