You would have to get an adapter to do that with the 79 as the perches are setup up for multi-leaf and the rubber or urethane pads. There is no hole to locate the spring bolt in, other than the one in the upper pad.Customworks has a metal adapter to use in place.



Some of the guys using urethane have had them shift on the spring as they are more "slippery" than rubber. I have them on my 81 and no movement.