For the electrical connector at the power transistor, find a decent used one from a JY and cut it so you have at least 6" of wire, then cut off your bad connector and splice the replacement into the harness. That way it won't be short.

The other electrical components should be available at the yard also.

The battery tray is a little more difficult, but while the motor is out is out, maybe the shop can weld in some metal to repair it.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum