I bought a good looking "big tube" swingarm, from the 81-84 model year, to install on my 79. You can immediately see why this would make a difference in handling on the rear. Max bmw microfiche makes it look like the pivot pins are a different length, does anyone know if I need the shorter pivots to run this swingarm? Or maybe I can put earlier style bearings and seals and use the original pins? I was expecting to change the bearings anyway, and would prefer to avoid buying 70 dollars worth of pivot pins. I know I have to mod the rear brake switch also, but unfortunately, the instructions on this forum have lost all the pics that used to be there.