Bought them with the IS38 Hardware kit on ECS Decided to go with the RS7 plugs. $25 bucks(for all 4), I can cover shipping. Let me know if you're interested.
I run these and haven't had an issue it's what Apr used to recommend. I think I paid like 40+ for all 4 so $25 shipped is a great deal.
Everyone has been talking about the rs7 plugs though so I will probably get those next. These cost less than half of the cost though and perform better than stock so for nice 10 minute project go for it