Yeah, that's the big problem with the RB. I think it does share a part or two with the old L24/L26/L28 and maybe the CA18DE, but am not sure enough to say it for sure. Unfortunately, we never got the Skyline, Staega, Cedric, or Holden Calais (RB30) in this country, so parts are somewhat inconvenient to come by. It also has a high buy in price initially, and needs quite a bit of mods to really wake Godzilla up... Then again, if you had the money to do it all, it still has a lot of potential. If I was going to do one, it would probably be in a early 240Z as I have a thing for old Datsuns. I'd also rock a PL510 with a SR20DET and a S15 6 speed swap. Swap out the R160 diff for either a R180 or an R200, then add some decent brakes and 15 or 16in Panasport wheels and have a very quick little classic car with more character than any new import will ever have.