As 650skull says get the left side caliper to match the one you have. Some of the XS750, XS850 and XS1100 used a different caliper, look at the pics very closely.
Get another front rotor, they fit both sides. The XS1100 rotor, some are slotted, lighter and work better. If you shop around you may find them that are slotted and 5 mm thick nstead of the 7mm like the 650 uses. Much lighter and work vey well.
The longer banjo bolt, another lower hose. Replacing all three with Braided stainless is a very good upgrade. The stock Master cylinder is a 14 mm bore and is ideal for a dual disc front brake set up. Works great on mine.
Leo