FMJ caliper interchange questions

The spindles can be used on either side. It does matter because it changes the caliper location, front or rear, depending on which side the spindles are mounted.

As for the calipers, this is what Cass (DoctorDiff), says on the matter...

DoctorDiff said

You must mount the calipers toward the rear if you are working on an A-body with a '72 and older sway bar.

'80 and newer F-body calipers and '69 Camaro front disc hoses work nicely when mounted toward the rear.

'79 and older F-body calipers and '73-'76 A-body front disc hoses work nicley when mounted toward the front.

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As far as the van calipers, I would say no. They usually shared parts with trucks or C-bodies, and those don't interchange with A/B/E/F/M/J bodies.