I have a 500,and fitted twin discs,
well worth it ,the front now stops !!
just ensure your right leg has the mounting bosses,they will need tidying up to accept the caliper mount,
it is a mirror image of the LH side,
if you obtain a double lenth banjo bolt for the tree ,it will save any hassle with stoplight switch,also fit new seals to both calipers ,so both
work perfectly ,
use a Goldwing GL1000/1100 master cylinder from David Silver ,this is for twin calipers,and look original ,
all thats needed is careful assembly,the LH side will be ok,but the RH side will need careful setting up,make sure the pivot is free,,and the pads are as close to parallel to the disc as possible ,.
the work is in the detail,its worth it !!