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Just a difference in ratio, no size differences. We had a rack replaced in our 88 and they put the wrong ratio in the first time :mad Got the Z51 ratio put in after that..
i just replaced my z51 rack in my 85. got a ac delco rebuiltt from the last detail. price $222 + 13.50 s/h and 150 core charge. this was the best price on a delco rebuild uni that i found. installation was not bad except for the flare nut on the larger hose - had to get a 18mm flair nut wrench from my local napa dealer. one of the forum members has a good write-up in the c4 tech section on steering rack replacement. hope this helps -