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Well, I'am no 'output flange' connaisseur, but the above pair is most likely 915 late style. The 110mm CV flange diameter is typical, as are the 4 x M10 bolt holes and the two dowels. Useless for any VW-type vehicle as 110mm CV joints only come with Cv's that have porsche axle inner splines, unless of course if you can also use the porsche CV's at the wheel end, then a porsche axle of the right length can be used.
The 90mm (your 88mm) CV's are most likely VW bug CV's, so those flanges are probably from an IRS bug anyway.
I have rounded of your measurements as there are only 3 relevant CV sizes: 90mm: bug
100mm: T2/T3 busses and 944. 944 has probably different (porsche) inner splined axle size then VW busses have!!
110mm: late 911 (most, not all!) 915 gearboxes.
Simple.
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