So Im sh*tcanning my A15 thats been in the car since I built it (flattening cam lobe issues) built an early A12 "race" motor I had laying around - literally! and am looking at the engine mounts - looks to me to be a later crossmember with the LH short mount boss.

A15 in car
[img width=300]<a href="http://s253.photobucket.com/user/evan ... pswx79xs1p.jpg.html" target="_blank"><img src="https://i253.photobucket.com/albums/hh ... unt_zpswx79xs1p.jpg" border="0" alt=" photo A15 LH mount_zpswx79xs1p.jpg"/></a>[/img]
[img width=300]<a href="http://s253.photobucket.com/user/evan ... pswojfqjiy.jpg.html" target="_blank"><img src="https://i253.photobucket.com/albums/hh ... unt_zpswojfqjiy.jpg" border="0" alt=" photo A15 RH mount_zpswojfqjiy.jpg"/></a>[/img]

A12 going in
[img width=300]<a href="http://s253.photobucket.com/user/evan ... psehkfj5vp.jpg.html" target="_blank"><img src="https://i253.photobucket.com/albums/hh ... A12_zpsehkfj5vp.jpg" border="0" alt=" photo A12_zpsehkfj5vp.jpg"/></a>[/img]
[img width=300]<a href="http://s253.photobucket.com/user/evan ... psrbh5slfn.jpg.html" target="_blank"><img src="https://i253.photobucket.com/albums/hh ... 201_zpsrbh5slfn.jpg" border="0" alt=" photo A12 1_zpsrbh5slfn.jpg"/></a>[/img]
I know the RH side motor mount needs a longer plate to mate up to the bracket on the engine but what about the left side? It doesn't really look like it lines up , left side is the shorter boss on the Xmember. were the really early A12 Xmembers on the RH side canted towards the front of the car?

Also wondered if theres a SN breakdown to ID exact age of motor, cant find it in the Wiki..

Thoughts??

thanks!