Ok, a little snooping in the PET and I think it's one of these:
I vaguely recall having to remove the lower right one to get the shroud out since this car is a cab with that extra strut that gets in the way. Now I have to figure out how much disassembly is required to get out back in. I must have taken it out in order to get the shroud out so it might not be too bad. And it is an M6 x 12 so that collaborates with the part in hand.