[D13]

There are no kits because the parts are plentiful and replacements are available at most parts stores.

Assuming it's a V8, you need box, pitman arm, hoses, bracket, and pump. And nuts and bolts. And belts. And make sure you have enough pulley grooves.

Easiest way is to rob a jyard truck. Other way is to seach thread for pictures, for example 'Restoring Rusty' just below has some good pictures of a mid 70's V8 truck PS set up.