We heard from one person that said our corrected H2OOOOOOO was slightly too large for 1/87 scale. So we rescaled one down. Left the larger version up. The 4x4 'BIG MEAT' tires will work with this. Because this is the most accurate H2 SUT out there, and because we designed errors into it. We have opened this up for FD material. But we also raised the price on FD material too God like levels. Because we know someone would copy cast it in a heartbeat. If they want to copy cast this in FD material, it's going to cost them big time. Copy casters ruin it for everyone. Sorry, we must protect our designs from less than honorable people by any means possible.