Hi Frankyboy,
what Leo said.
Also, if your stock M/C is rebuildable, consider adding the leftside caliper & brake disk.
Although the stock M/C's piston has twice the area it needs to work a single caliper it's perfect for dual disks.
Best you toss those time-expired fabric-reinforced stock brake hoses and replace them with stainless hoses whichever caliper decision you make.