Can anyone tell me the specific parts I need to replace the grip safety and hammer on my Springfield Armory GI Champion (part# PW9142L)? I would like to change out the non-beavertail type grip safety to a more comfortable beavertail type and I think I need to replace the factory spur'd hammer at the same time. I realize that there is some fitting involved for these parts, and I am up to the task, I just need to know where to start in finding the right parts. If you have specific part numbers or Brownells stock numbers that would be awesome! There are so many parts out there, I just want to make sure I order the right ones.