bucket seat brackets which ones do i need?

[Project77]

okay so i have made up my mind i am going to buy the summit racing seats for my truck http://www.summitracing.com/parts/SUM-G1159-2/ but i dont know which brackets i need i want to be able to slide it back and forth and i also dont want to be sitting on the floor im about 5'6" if that helps any haha and my weopon of choice is a 1977 chevy c10 single cab silverado long wheel based with the bench seat no other mods have been done to the interior so please if anyone can help me choose the correct seat mounts i would greatly appreciate it and im looking to purchase these seats and everything tommorrow
thanks in advance