Hi i am the owner of a 1.8 97 miata that was blessed with an open diff :( . i’m looking at a torsen and am probably going to purchase it for $300 but the mount is broken. would i just be able to take the main differential housing off the broken mount and onto my stock 1.8 open diff mount?
(edit: the torsen is off a 96 m edition so it has the same 4.1 gear ratio)

 

Yes, the housings should be identical. Good luck on your mission of ridding the world of one more open diff miata.