hub binding on the rim, help...

I have 82 911 SC and mounted 16" turbo 930 rims on it. Rear rim 16x8 with 245/45/16 is marked ON THE INSIDE from the contact with the hub. Do I need spacers and what size if so?
Who sells spacers and how much?

Anybody else experienced this?

Thank you guys

Can you post a pic? I'm having a lot of difficulty imagining how the hub can possibly be rubbing on the rim. 16x8 with a a +10.6 mm offset was optional on that car. Does it spin freely when jacked up? Or do you mean the tire is rubbbing on something? If so what side? It makes a difference. On the passenger side the oil lines are the most likely culprits with thye smaller offset of the 911 8" Fuchs. They can be repositioned for better clearance. see http://members.bellatlantic.net/~vze2fb3y/ or
http://www.cheaterswayside.com/911/ user wmv for pics. I have used 8x15(+10.6mm offset) with 225/50, 8x16(+10.6 mm offset) with 225/50, 9x16(+15mm offset) with 245/45, and currently 275/40x17. Only the later required any mods at all.