Here is a set of wheels for sale on Ebay that would look wicked on a Bellett, the +21 offset will just get under the rear but if you machine 7mm off the inside face of the rim they'll fit like a glove with a set of 205 45 16 tyres.
If you can afford the price tag that is
http://www.ebay.com.au/itm/Work-EMITZ-A ... 542wt_1185