I prefer to use GM parts when possible. I have had problems with Ratech crush spacers before. I had one split right down the seam. Had to disassemble the rear end again to change it. There are some that are only made by Ratech, so you don't have a choice. The Strange spacer was probably a GM spacer. I'd like to see more than 160 foot pounds of torque on the nut. That just isn't quite enough. Should be at least 200 or more.