Anth Oh I didn't realise it would be stamped in there. I'll check that out! I'm waiting on the local dealer parts guy to get back with a reference off the VIN too. Mostly I'm hoping I can square it away before Christmas but I don't have any opportunity to jack the car up for a week or so.
My read on the brake setup is we can probably go 316 to 336 just by changing rotors, carriers and possibly dust shields (some are saying the difference is negligible enough not to swap the shields out…). I guess that's a next set of brakes job after this.