Having just lowered a Vision recently, I can say, without a doubt you will need the Ness saddlebag inserts OR buy the 8-Ball shock. The 8-Ball shock will not allow the swingarm and pulley to hit the bags. Not sure if the 8-Ball shock has special dampening or an internal stop. It is a different part number than the other models. We lowered the vision 1 inch from stock and cracked the saddlebags (inside) on both sides during a series of test rides... You have to do something to protect the bags, either the Ness inserts or the 8-Ball shock. Just the link and your lookin' for trouble. I guess you could pump the stock shock up to about 50-60lbs but the bike would ride like a bucking bronco...
We now have the Ness inserts on order through Arizona Vic. For some reason Ness will not sell the inserts to Joe Q. Public...
BTW, Offroad Express Victory makes the sweetest lowering link. It's fully adjustable from stock to 2 inches lower. OffRoad Express Erie Pa, phone # (814)825-4747 ask for Brian. $150 plus shipping...