The 2nd Gen trannys are interchangeable between S4 and S5, however you need the corresponding mount. The 86-88 S4 tranny mount is different than the 89-91 S5 tranny mount.
Here's a picture of the two different mounts on some parts trannys.
http://img143.imageshack.us/img143/225/pict0019md8.jpg
http://img260.imageshack.us/img260/8332/pict0017xj4.jpg
86-88 Mount
https://www.mazdamotorsports.com/wcs...02241_1000.gif
89-91 mount
https://www.mazdamotorsports.com/wcs...02141_1000.gif
Hope that helps.
Mark B. - Dallas, TX
#76 RX-7 2nd Gen
SCCA EP
Former ITS, ITE, NASA PT
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