I crashed my brand new DF-03Ra on the first battery and the Bumper broke. I ordered this bumber to replace the original one. It is the same size as the bumber that comes with the Datsun 240Z DF-03Ra kit.
For some reason the replacement bumber seems more solid than the original. I haven't broken one yet. The replacement bumper also fits a little better on the chassis - maybe the tighter fit makes it more solid.
Anyway, get this to replace the DF-03Ra bumper that does not have a parts number in the assembly instructions.