I'm putting 60 axles under a 55 project. Alcans for a 55 on the way. on the rear having to move the axle perches in 3 inches. I have noticed a difference in the perches. 55 fairly plain, 60 has rubber pad insulator with large retainer, requiring large hole in perch. Question: is there any major advantage of either way? Better ride or no big deal? Thanks for any help.