[Bruce.]

Ah, very helpful as doing this currently.

I don't think the inner pad will need clearanced much because the origanal 944na caliper mount has spare metal so could be thinned by a mm or so. The outer pad is tight to the hub so thinning the back plate is required (didn't spot that).

One remaining concern I had was my 944na disc friction surface has a beveled edge on the outside and inside, to the original pad size I think. If the disc was flat to the edge (inner & outer) then it would be a neat fit. I have got new Pagid rotors. Perhaps another brand would not have this bevel (Sebro?). Kai, what brand are yours and are they also bevelled? (The inner edge looks to be more of an issue).

I did wonder if I could machine the 944na hub so the bore was correct for the 986 rotor. If the 986(S) rotor still works with the 944 handbrake parts (mentioned above by Lanner) & is 67mm high, would the 986 rotor (which is also 67mm high) work with the 944 handbrake shoes?
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EDIT:
Ah I see the 2.7 (non-S) boxster used different handbrake shoes and hardware. Narrower I guess?
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That might require 16" rims but my front rotors already need that.