Yes, all Grade 8. Believe me, it was a battle. For all the time and money I put into this bumper mod I wish I'd just ordered a new bumper (which I know I'm going to end up doing eventually). Live and learn . . . FWIW, the metal shop guy who made the backing plates is a TJ owner too and we discussed the concerns raised by you and 05 Blue about where to locate the mounts to give the stock bumper the best chance of survival. Seems pretty stout to me, but I've never been in a "serious" recovery. Will do my best to avoid . . .