Haha, no sooner than I say I dont think I will get a reply from Parks Sabers, then I try calling one more time and get the guy on the phone. From what he was telling me the Grenade piece that he offers is a direct copy of the same original grenade used used by Master Replicas to make there version. Sweet!
These parts are made by a guy call Russel Brown in the UK, in collaboration with a couple of senior prop makers who are authorities on this particular saber. You can't go wrong with Russ's parts when it comes to accuracy.