Top original 11mm holes with broken exhaust rocker.
Middle. Replacement 11mm in worn condition, side play on rocker mounts.
Bottom. Beautifully refurbished 9mm unit with new needle roller bearings, no side play and super smooth action. Trouble is case hardened steel too tough to bore out to 11mm head bolt diameter. Wolfgang took it to a machine shop in Suhl and they tried but had to give up.
The middle one gets the nod - it'll fit straight on. If I have any more breakage then I can have the head bolts turned down to 9 mm.
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