Does anyone know how to tell the difference between early calipers and late 914 calipers? Also the difference between front and rear? I took these off and I cant remember what they are. I'm fairly sure there early but not sure if there front or rear calipers. Thanks
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Look like late (2 bleeders) & front (no spring for the E-brake) to me, but I'm no expert.

Try PM to Eric Shea at PMB (admin & member vendor on here) since he's our resident brake guru, and can make those look & work like new btw!

the easiest is that the early (through late 72 have one bleeder nipple and the late (very late 72 and up through 76 have two bleeder nipples. Early have a smaller pad opening width wise than the lates which have a larger width pad opening for the thicker pads.
The rears have the emergency brake arm. They will interchange the early with one bleeder the late with two. 914-6 rears have a bigger brake pad opening and a rounded inner half as opposed to a square 914-4