So many I can't type them all.
You've got a good start, spread the lower mount to fit the bottom mount of the a3 and you've got that one taken care of. Now you'll have to grind away the old mount junk at the top so the motor can swivel upwards. Then weld on the two new top motor mounts.
few things to think about, if you have not
rear gearing vs wheels
gear alignment, chain walking and wearing out if not aliged
swing arm travle and chain tension
easyest way is choping out the whole bottom half motor mounts and swing arm area and weld that into new frame, that knocks out alot of those problems above.
but it can be done that way also, i have
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