Help needed.... URGENT

I have a Buick Roadmaster Wagon 1991, same as a Caprice. Im running 18x8 up front and 20x8.5 in back and have no idea what the offset is and my car is no where close to me so i can measure. Can anyone tell me the offset i need for the rims. If someone knows alot about offset and has one of these cars and will measure i WILL PAY YOU! I need to know asap cause i have to tell the wheel company today.

thanks in advance.

bump

Have you tried checking a caprice/imapala forum? you might find help there.

Good luck!

waiting on my buddy who is a wheel rep to call me back. i will post back as soon as he calls me.

Ok so you're buying 8" front and 8.5" rear?

If so... then a 5" front and 5" to 5.25" rear will work out fine.

So..... a +13 front on the 18x8 = 5" backspace.

The rear again can be 5" to 5.25" backspace which would be 8.5" wheel with +6 or +13.

If you plan to run 20x8.5" front and 20x10" rear (which fits bagged applications as well) then you're looking at 5.5" front and 6.25" rear backspace or +19 front and +19 rear on the 8.5" front and 10" rear wheels.

You can donate what you want to my paypal address baggedK@hotmail.com haha.

Ohh by the way- if you're ordering the Bonspeed wheels..... if they were a decent company that was knowledgeable with their product that they produce, they would have already known the fitments for your application.

jody u gota number i can call ya at? donation sent!