it's not illegal to go wider guards
yes jap warehouse/mu secret are just selling JSAI parts
ok, you're in a different position to most. You have the luxury of deciding which way you want to go, GTT sized stuff or GTR sized. Because you HAVE to change everything due to the smash, you have both options open to you at essentially the same cost.
This is NOT the same for pretty much everyone else in this thread, as they have to work with the standard GTT guards, you don't as you're replacing them. That's why there is talk of trying to find bumpers that are GTT friendly, etc - you don't have to worry about this.
You are not restricted to GTT sized stuff anymore because you are having to replace EVERYTHING.
So it's a choice between a GTR front end or just the normal, narrower GTT front end. Considering it's going to cost pretty much the same, you may as well go GTR sized because it will bad ass