Need help figuring out what years these came from so I can rebuild them. All ATE, all 3"

#1 Measured 42mm but I think its 48 behind the seal. Disc gap 24mm. M front?




set2- Pretty sure it's 38mm. Disc gap 14mm.



set3- Pretty sure it's 38mm. Disc gap 24mm. Small diameter at pad contact, 27mm.



set4- Pretty sure it's 38mm. Disc gap 24mm. 34mm at pad contact.

Yes, I think that you are correct: 911 parts. The rears are definitely 911/late 912 non-vented. Fronts are for vented rotor, and probably came from the same car.

Updated. Still could use some assistance.

You have M-Caliper Fronts and M-Caliper Rears

Basically 1970-1974ish 911T Calipers

48mm Front Pistons
38mm Rear Pistons

All with knock-back mechanisms. Pretty common stuff. We have all the kits in stock.