I have a 1 pc tail that was made from Pyramid out of UK. I bought it on ebay years ago when I thought I was going to do endurance races with the B12. (my wife persuaded me otherwise
) Its a older R1 style body. For the motor I just put on NRC case covers,and I did try the left side out on a wet 4th gear roll-on.
I didn't have the R1 tail on at the time,its in good shape and was prepped for paint,but never finished. If your intrested,I'll take some pics. I paid $150.plus shipping,but make a offer.