the difference is the mounts for the suspension arms.the gazelle is a 4 link with coil springs.all these mounts will have to be removed & 1200 spring perches welded on.i have seen a 1200 coupe with a gazelle diff with most of the mounts still on (the 1200 in the picture in auto action,in fact,with the sr20),but it looked very busy under there.they are approximately 50mm wider than a 1200.the handbrake cable should connect without a problem.the price depends on the wrecker & with how convincing you are.'mate,it's just a bloody gazelle'.you can then get a lsd from a 720 4wd,which has the same axle sizes.