[Dave at Pelican Parts]

Mueller has done the job, so he can offer more direct insight than I can.

Generally, 911 studs and lug nuts are used. The 911 nuts have the correct round seating surface, and they'll be metric so your regular 914 tools will work on them.

I think you will have to remove the rear hubs from the trailing arms, just to get clearance to do this. Ditto the front hubs (which are a part of the front rotors).

911 studs are available in different lengths; not sure which you would need. When wheel spacers are used, longer studs are used. There are also bolt-on spacers (spacer bolts to hub, wheel bolts to spacer) but those are a lot more $$$ and are much thicker than 6mm.

--DD