Installing wheel pants and fuel tanks are my pet hate!

I have used two 5/32" wheel axles, with two SIG wheel pants brackets each side, supporting the pants with them on both ends of the axles.

That way you have a very firm support for both sides of the wheel pant, but still retaining the movement afforded by the two bolts tightened onto the axle in extreme situations. Even though the two screws hold tight onto the axle shafts, they still tend to rotate if there is excessive force from, say, landing in grass.

-David C.