I just went through all of this, first off, I had an old and new version of the mounting kits, and I had to go back to almost all of the old parts because they were just better. The copper wafers were stiffer and everything fit better, first the skinny wafer when tightened down kind of curved up on me? Can't explain that any better, so it made the contacts very close, second the foam pads squished from heat from 90 degree days here in Minnesota, so again horns blew every time I hooked up the battery. The new aluminum hub was VERY poorly made, where the wire was soldered to the back was actually in the way of the contact post, I couldn't even use it!! So I basically just used the new horn button wafer, had to sand the edges for the button to fit right, and then make use of all the old Grant mounting stuff. Just take it slow, check everything piece by piece, maybe even buy another mounting set and mix and match parts. Good luck!! PS: get a bunch of 20A fuses!!