Too bad they do not make the SSII in 205/40/17 as it would be a really good fit on 7.5 wheels, if they made them to the same general size profiles like the other SSII that is.
The 215/40/17 is pretty wide with an 8" tread, 8.6 section width, I would prefer it on an 8 minimally and an 8.5 or 9 better.
The 205/45/17 is a better fit on a 7.5, 2lbs lower weight, 7.6 tread width, better feedback and control but getting fairly tall though for autocrosses it could be the tire that keeps you in second gear so less shifting which is always better in such events.