I Bought some Mag wheels off another Z driver, attepted to put them on my stock 240Z and they didn't fit. The bolt pattern is fine 4x114.3, but the offset is slightly too much, that is, I could see the tips of my wheel studs in the wholes (a bit past flush with the rim) but there was not enough length on them to get a bite with my lug nuts. I looked into adapters a little bit but don't know what can fix the problem. I need to extend the studs about 1/2 inch or so. Also the rims stud wholes have a good deal of space when the stud fits in them, is there a stud adapters that can just srew on to the old stud like a sheath sround it and then stick out a little more? What is the best and least expensive way to fix this issue...???????????
-Mike, from UC Davis

 

are they factory Datsun wheels?

Maybe they are mag wheels and you're trying to use acorn lug nuts meant for steel wheels.

Can you post a few good pics of the wheels. Maybe one with them on your car?
I don't think this issue is offset related. The wheel mounting surface should fit the studs no matter what offset it is.

 

any tire/wheel place should have longer studs that you can put on your hubs if needed.