yow

I've got some 345s I want to try on the rear of my c5z but I need some wheels. I'm not particular. I'd buy two just for the rear or a full set of 18s of the price is right. I could even trade a set of 4 c5z Speed lines 18x10.5.

I need someone who can tell me what offset and backspacing I need, if possible. I've not run 345s out back before.

While I'm here I'll ask, do I "need" flared fenders? Or can I just rock without them?