Brand new to this site, working on 74 , drilling out the rear hubs and rotors, what size stud is used for this conversion? I can machine them myself but do not have knowledge of stud used...

I believe you need a 14mm drill bit and the factory stud will press in the hole. I did this conversion about 8 years ago.

you need to spot face the backside ..also, or they be crooked

M14-1.5 x 45mm

let the madness begin

I have factory Verbus Porsche studs in the following lengths:

45mm

52mm

66mm

100mm

45 and 52 were stock offerings depending on year and wheel. 66 for use with 21mm spacers and 100 for use with spacers

Sled