5mm might give you too much offset causing rubbing issues up front... instead i used a 3mm spacer from a mustang gt500 from H&R because they don't have anything smaller than 5mm for our car other than the one from T1R (good luck getting anything from them within a month).
anyways, the Mustang GT500 spacer fits almost flush but the middle bore space is about 0.5mm larger on the spacer but causes no problems that i've seen. The 3mm spacer would be a good solution so you get clearance on the bbk and the enkei wheel

The part number i believe is 0665705 from H&R springs. hope this helps..

 

A 235/40R17 is going to give you a smaller rolling diameter and will therefore give you a bit less chance of fender interference.

Do the math. (I did and I used this size successfully myself)

 

A 325....really? That would be um....a large pinch. Plus, the whole point is to eliminate wheel gap. 225/40 is the correct size, and yes you likely will need some fender modification.

 

Its been awhile since ive posted. ive gone 255 all around since the last post. Enjoy some daytona beach:

 

 

^yellow one above looks real good. I actually like the Cr lip with your setup. I need to find someone that has the 17x9 +45s in silver in stock.

 

I would sell you mines, but I'm going with the 17 x 9 +45 and 17 x 9.5 +38 setup! I'll post pictures soon too. haha

 

^^ Nice pics !!
How you like your Ventus tires?

 

chick in the pic has camel toe if u look close enough.. lol..

 

^haha Andrew you would notice that.

For anyone needing to get 17 x 9 +45 I can get them to you for a pretty good price. Just trying to help you guys out haha. Pm me for more info.