Offset for wheels off a R107 SL

[Tim29]

Hi guys

I'm looking at buying a set of alloys for my 190E 2.5 16V but the seller doesn't know much about them. I know they're 16x8J so reasonably wide but am not sure on the offset. They came of a 1980 450SL (R107), does anyone with a R107 with similar sized wheels be able to tell me what offset they are?

thanks

Tim