The hole through the side of the pan lip for the front bolt isn't a full circle, not enough room. But between the C shape of the hole and the fender washer bending over the top of the pan above, it's still pretty strong. An extended bolt so it isn't trying to bend the lip. It's not like there's ever a lot of stress on it anyway unless I accidentally step on it. For the back mount, you can see the chunk of aluminum stock that I cut and drilled as a bracket.