Vil
1. I would really query that quote on the wheel import ex USA. Those KMC wheels in 20 inch typically sell in the US for around the $300 each and door to door shipping
air freight (the usual means) ex US west coast to Aust east coast is going to cost around $700 + for 4 wheels.
2. A 10 inch rim with 35 offset with 275-30 -20 tyres is going to hit the guards and the tyres will also hit the bumper bracket. You are definitely going to have to roll the guards and grind down the rear bumper brackets in the wheel well.
3. The picture of the Commodore above with the KMC 775 Rockstar wheels has the large ugly centre caps removed. These wheels look terrible on Commodores with the big ugly stupid looking centre caps on them.
4. There are quite a few decent black wheels available to fit Commodores in 20 INCH from reputable manufacturers. However you will commonly find that many of the wide versions (10 and 9.5 inch) come in offsets of 35 to 40(frequently 35)
Here are a few you might want to look at in
20 INCH and these are all available locally .................pictured on a COMMODORE -
BAVARIA BC 10 - see the bottom of the page here...........
http://forums.justcommodores.com.au...3/211957-aggressive-wheel-treatment-ve-3.html
NICHE GT 5 = see here.................
http://forums.justcommodores.com.au/ve-wm/165600-evoke-ssv-us-why-yes-7.html (The 10 rears are 35 offset though)
ZUMBO Veige -- see here .........
CopyofP1000253.jpg Photo by jkgmh | Photobucket and here...
Happy Customer Cars ' 8/07/201105 September 2011 | Facebook
VERTINI MAGIC ....here ....
https://www.facebook.com/photo.php?...81115102.16801.122361571124603&type=1&theater (The 10 inch rears are also 35 offset)
VERTINI Monaco ....here......
http://forums.justcommodores.com.au...eries-manual-sedan-vertini-monaco-wheels.html
TSW do various black wheels in their range which cover 20 inch Commodore fitments. Most of the wide black wheels for the rear are 35 offset though. ...here ...
TSW Alloy Wheels Australia - Vehicle Fitment Guide
Have a look at the TSW Gallery on the Aust site (Holdens) and the US web site (for pontiac G8)