My .02$.I have Morris alum. mags on my unit.It came with the cush drive.One day cruising on a city street,I rolled off the throttle and all the sprocket bolts snapped.Cushions I think were a little soft and allowed too much side load on bolts.Anyway,I drilled and tapped the holes for3/8" bolts,deep sixed the cush drive,and countersunk the holes in a new sprocket ,and used 3/8" countersunk bolts.Works fine,looks good,and has survived muchos high load miles with no problems,and I like the more positive feel too.