[Liv4spd]

We've just finalized the purchase on our new SPF #1845 and I'm seriously considering a set of PSE 17" knock-offs to complete the setup. My question is, I've enquired into a set of 17" wheels with a 5" backspacing, is this an adequate amount or am I going to run into “issues” when it comes time for mounting. Additionally, in our e-mails he posted something to the effect of..." the wheels fit Trigo adaptors, not the new SPF ones," and unfortunately this threw me for a loop because I was under the impression that all the SPF pin drive setups where the same. Can anyone set me straight on what the correct offset/backspacing I'll need to fit 335/30/17s on the rear with 275/40/17s on the front.
Thanks in advance!