I don't really like the lug bolts on bugs so I installed pressed in studs. I used Napa # 641-1264 which is M12-1.5 x 36 mm long. In order for the head of the stud to sit flat I had to slightly grind the drum. I then drilled out the threaded holes in the drum using a 15/32 drill bit & pressed in the new studs. The lug nuts I ordered were Dorman #611-201 which have the proper ball seat for VW rims. On two of the holes a previous owner had installed heli-coils. On these two I had to put three tack welds on the knurled part of the stud to get an acceptable press fit. I trust studs so much more than the bolts, plus it makes putting on the wheels that much easier.
Long Valley, NJ