I can run the 7" wide RX2s, with 215 wide tyres and 10mm spacers at the rear, with no problems.
7" wide offset is 43, 6.5" wide offset is 42...so as near as dammit the same.
You should be OK at 15mm...but as has been said, you may find 20mm spacers at the rear touch the 205 tyres.
On the front, 10, 13 or even 15mm, depending on camber.