I have been research the VN1500 as a posible source of a rear axle, some years and models use the same bearings as our VN750, the thing is I can't find the specs for length... now there is another way of dropping the back while still using those brackets. You need to have the Axle Hole reamed out to 1 1/4" to 1 3/16" dia x 1/8" deep. Then find a 5/8" shock bushing for a car and remove the metal bushing cut the bushing to a few thousandths of an inch less than 1/8" and drill out the Axle Hole center to make a pressed bushing. Then you need to cut your castle nut in Half and weld a washer onto the back side. Like I said its complicated, but it is safer than trying to grind down swing arms, and is a lot cheaper than a new axle... the Shock busing is only $2.50 for 2 from Napa. I am not sure how much the Machine work would cost, because I had mine built with the recesses in already.