And 40mm is the width of the shoes. Some early beetles had 30 mm wide rear shoes, so check yours first.
Oil probably coming from leaky hub oil seals if it's a swing axle car, so no point fitting new shoes until you've sorted your oil leak first. Swing axle tubes are full of gear oil - it lubes the wheel bearings in the end.
Mk 2 Scirocco 1600 GT new clutch kit
Mk 4 Golf front brake discs & pads new in box (288 mm)
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