OR Suregrip is Suregrip, Power lock is power lock..less confusion that way :)
Think of it like this you walk into the parts house say to the counter guy "I need rebuild clutches for a Posi..."that guy is looking in Chevy parts catalogs...
I once had a 1990 Ranger. I went in said "I need a thermostat for a nineteen ninety ford ranger, the guy gives me parts for a 94 ranger...it pays to be specific..." :) The ranger story is true by the way... i started saying "ninety ranger" after that episode.:)