We salvaged one (whole ABS module) from a pick-a-part yard. Cracked it open, resoldered the power connectors, and resealed it (some RTV, some Gorilla Glue, and electrical tape; not the prettiest job). The power lines from the ABS motor to the controller were also trashed; the insulation completely gone. Cleaned it up as best we could and wrapped each line in electrical tape, then bundled them together with more tape.
When we were bleading the brake lines, we hooked a scanner up and it was smart enough to be able to bleed the ABS system. When we did, the ABS motor kicked on and off and the scanner completed the bleed process. Have not tried to slam the brakes on grass or gravel to see if it works under real world conditions yet.
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Just about every ZJ I've seen at pick-a-part yard had the ABS system intact (but wires in sad shape). So you should be able to find one; you'll probably just have to do a 'rebuild' like I did.
Edit: We also pulled the motor off the top and cleaned the motor spindle and added a bit of grease to the needle bearings. Did't take any pics of that process though...