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You might also consider a set of front calipers from a '72-'74 BMW 2002tii. They're a four piston type that allows use of pads that are quite a bit larger. They are a bolt-on swap, but the hard line between the flex hose and caliper needs to be modified, as the BMW calipers have two fluid circuits (one for the top 2 pistons, and another for the bottom 2).
I've got them on both my Spiders and they work very nicely. My '74 Spider has a 22mm MC, but my '87 had a 20mm, which wasn't moving enough fluid without a long pedal stroke. I changed it to a 24mm MC, and that seems the ideal match. It takes a little more pedal pressure than the 22mm, and has less pedal travel, but either 22mm or 24mm should work well enough.
I've got a BMW friend that had quite a few sets of factory-rebuilt calipers last year, and I was buying them for ~$160/set (no cores required). If you'd like me to check for another set, let me know.
Regards,
Dean
Lutz, FL
'74 & '87 Spider Veloce's
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