Ryan-
Thank you sir for your reply. Would these retainer brackets be generally plastic? I only have 4 Mobo's right now and if I look on the underside of the board it appears I have:
1. A Slot Processor Plastic Bracket (so it has 4 tabs poking through the back side of the board)
2. Second Board is (as you said) an Aluminum Heatsink Bracket (again 4 tabs poking through the back side of the board)

Both of these should be removed from their respective Mobo's?
Thanks!