I don't run wheel pants on my RV-4. I removed the blind nut on the end of the axle nut that secures the outboard side of the wheel pants to save weight . I found these plastic caps that dress up the nut a bit and reduce drag. https://www.ebay.com/itm/White-Roun...984132?hash=item2112c77c44:g:rdYAAOSwuzRXf7nf The 1 5/8" is a good fit.