I bought a kit a few years back on ebay. the trick to it was that you had to drill out the rivets on the rubber cushions on the bottom of the backs and scoot them inward about 5/8 of and inch which made the bags scoot outward at the bottom. actually made the bags look better. the downside was if you had nostalgia bars on the bags it made the bags rub against them moreso than stock possition.

 

The company that reworks the factory shocks is Bitchin Baggers.