I think there's many many Soviet flame tanks out there, especially on the resin / limited production side. From mainstream manufacturers, I remember Italeri/Zvezda's flame thrower T-26 and then there's dragon's T-34/85 (utz mod) that comes with parts to make a flam tank. These parts (I'm building that particular kit right now as a regular tank) just replace the front mg with a flame thrower. If you got a T-34 kit in your stash and want to build a flame throwing T-34, I could send you those extra flam tank parts. Here's scans of the parts:

