I was on the fence, but after seeing these I'm going for it!
Yeah, I had no way to exert much force on the screw since I left the wheel on. Yes, used the set of brackets with the long and short sides today.Cool. Can you confirm that your L bracket had a long and short side?
I installed the rear flaps today. Took off the wheels. I know what you mean about the plastic insert spinning. I was using a drill to put in the screws and found putting some weight into it stopped the spinning and it snug up tight.