620 multistrada motors don't have bearings for the swingarm in the back of the cases so won't work in Monsters/SSs.
Or you could buy my spare cases and swap all the internals over!
6speed boxes and ATPC "slipper" clutches can be fitted to early 5 speed motors
HTH, Paul
Paul
15th year in DD #68 and getting slower by the year
1199, SS800 & 620SSie DD racer