buy your shocks brand new. dont pull that crap. People on here love sensa-tracs, if you plan on really lifting more than an inch or two then get the 4x4 shocks. I did a generic brand bu they are lifetime warranty so I can replace them for free later on.
for coils off a full size.....idk lol....post a new thread about in under suspension tech, i imiagine any modern 150 spring would suffice
for leafs pull off a modern(ish) explorer. to be safe lets say 95+ (so they still have spring)