Hi Andy, and welcome to NSR-WORLD.
The 1987 MC16 and 1988 MC18 run a large flywheel, and the 89~97 models run a small flywheel. As you noted, the mounts are in a similar position on all cases, so you need the correct pick-ups. The reverse side of the mounts are shouldered for location, but I guess you could try to remove the shoulder and then slot them. But really, it would be simpler to just get some more of the correct type.
_________________
Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
Check us out on Facebook! Please "like" our page!