17" 7.5 with 6" offset?

I found a good deal on some Alba wheels, but the guy said it had a 6" offset. I understand I need like an offset of +38-40 to aviod running a spacer in the front? If I do the calculation 6" is 15cm? is offset measured in cm? if so will I be able to tuck 6" offset on my 86 bagged yota?

it probably is 6" backspacing not offset theres a difference

so with that said, I'm unable to figure out if they will tuck on my truck? I need to figure out asap, aution is ending soon.

he can tell u what teh offset is...almost all wheels especially custom wheels have the offset on the back of the wheel...ask him to give u the numbers from the back of hte wheel..or better yet..tell him to take a pic of it