The PO did a 5 lug conversion on my car. I gues it was the right way to do it, drilled hubs and installed 5 lug rotors with studs. My question(s):

1) Does this mean I have the /6 type rotors?, and
2) What is the minimum allowable thickness when getting them turned?

Thanks

Yes... you should use 914-6 rotors.

Minimum thickness on those solid rotors should be 0.35 in (8.9mm)