These half-moons are mounted in the axle shaft and allow the drive shaft to articulate. Of course, they must not be overly lax. If that's the case, you'll have to replace them.
The clearance is measured with a feeler gauge and must be between 0.035 and 0.244 mm.
The slides or fulcrum plates mentioned here have standard dimensions of approx. 7.95 mm and are supplied in sets of 4.
Applicable to all air-cooled Volkswagens with swing axle
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