Yikes! that hurts. hope you manage to fix it. Reminds me of the time right after buying my truck I decided it needed new front pads and proceeded to unscrew the caliper halves..apart! I knew something was wrong when about a cup of brake fluid poured out onto my driveway. My first attempt at being a mechanic. We learn from our mistakes.
I've got some info here says the 1989 7MGE(Supra non-turbo) and the 3VZE(pickup, 4runner) have exactly the same AFM. same voltage, pins, everything. All other Toyota models are different including the 22re. Infos from a Chiltons I think. You should be able to find one cheap. Good luck.

Jay