I had the same customer service experiences with them, but the real bad news is the tolex isn't exactly right, at least not for 60's/early 70's vintage Sunns. Their stuff is kinda "puffy", or raised blisters and the Sunn stuff is sort of an asymetrical windowpane or burlap textured.
I haven't had my hands on a Model T in some time, but I would imagine they used the same tolex as an early 70's 200/2000S.