Take a closer look at some of the tbirds in the yards. I got a ABS master cylinder out of a 92 lx that had ABS as an option for my 89. I would guess that just about any 89-92 bird or cat COULD have it. BTW I bought the whole assembly 2 years ago from a local yard, and I still have to pump the pedal about 4-5 times before I hear the pump run. Total cost 1 1/2hrs to pull it and 16 bucks.
On my 90 the accumulator just went about 2 weeks ago. I found a 88 Mark VII in the yard with a similar looking master cylinder. Figured I would grab the whole thing. Doesn't really fit right into our engine compartment. The accumulator however fit right into my pump and PRESTO....brakes work wonderful again. About 2-3 pumps before pump runs. Guess I just had good luck.
Joe