So I have a newb question. What the hell is the difference between Series 70 and 80 1911s? I'm trying to buy new parts (grip safety, etc),for my Para 1911, and on certain parts I need to choose Series 70 or 80. How do I know what to pick? Any help greatly appreciated!

This is the gun I have:
http://www.ableammo.com/catalog/prod...ducts_id=83435