When overhauling the brake calliper assembly, replacing as many of the wear items, and even the none wear items that may be a little jaded over years of use as possible will simplify the reassembly and subsequent adjustments required to set up the brakes correctly.
Using the correct specification parts is the safer, more reliable way to go, as well as well as helping to maintain a good original appearance.
Other related components and fixings you may wish to consider:
Add as many items as you wish to the same shopping cart new disc-bolts 9010908718Flange bolts 9010510638 and brake-pads 1FKW004601 for example, and still only pay the same single fixed price shipping cost.
This component may have other applications in the Yamaha model range.