For my ever expanding Soviets I picked up two boxes of the new Plastic Cat Killer (SBX31). I already had 8 SU-100's with the old Resin hulls, but having no SU-85M's I thought it would be nice to have both options.
The box set comes with enough bits to make 5 SU-85's, SU-85M's or SU-100's. The guide on the back of the box makes it really clear what bits you need off the sprue to make each variant.
Thanks for reading