On oil cooler , I've used a big AT cooler out of a Mighty Max,,,,an AT cooler from a Gen 1,,, now I've got one from a 94 Diamante . It just depends on what shape will fit in the space you have to place it. Get a strap of metal from the hardware store and bend and drill your own brackets.
I'd stick with mitsu brand coolers to keep with the bango fittings. Also a "good $40 " tubing benden and some propane will allow you to ajust your steel tubing if needed.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.