Anyone know a good website where I can get alloy wheels in a certain width? I can't seem to find any sites where I can search/select by width (7j, 8j etc) and google searches haven't helped much

www.performancealloys.com list the width

maybe potn.com or alloywheels.com

Where would I be able to get much wider wheels than the ones on those sites? (10 inches wide )

Compomotive CXR come in 10x13"
http://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=MSPORT&pcode=COMCXR1360S

Not going to be cheap getting that wide in a wheel worth having.

How about
http://www.splitrims.com/
You are likley to need split rims to get that wide

http://www.alloywheels.com/tyrecalc.asp

There are a pair of 12" wide rims on ebay at mo........

I did a search earlier today they where sat on 99p with one bid, bit to wide for me....