Found a drivers side UCA bushing w/ washer and nut sitting on underside of my skid plate...

When installing the aftermarket upper control arm, had to cut the long bolt head off and flip it around for clearance. Clearly I didn't torque it enough (but also expect the shop I took it to afterwards to have worked on it, so I don't really know who's at fault. I'll say both of us), but I'm wondering what the proper torque should be so this doesn't happen again? I just got lucky as hell that I didn't both lose the hardware, or lose control while driving. Maybe I should mark it with a paint pen to check if it's loosening in the future?

 

Well I definitely didn't tell them the torque but I guess I'd assume they would know? Anyway, appreciate the info, I'll check them both with my torque wrench now