What year are the mazdas off of? Sorry to thread jack, but nobody has ever given me a straight answer on this. Hope you sell this set 
56" mazdas are '93 up , same truck and leaf springs as a ford ranger. These work good on 3rd gen trucks because the rear hanger is further back. Older mazdas (pre-ford years) have 52" springs. These work good on 1st and 2nd gens, you can move the front hanger and leave the rear one alone .
Do yourself a favor and stay away from double shackles.
