Hi and welcome!
I've found it's easiest to use Polaris # 5135275 adapters to reduce hole-size from 12mm to 10mm in frame & shock-linkages to use 10mm bolts from GSX-R. No hacking of frame or shock needed for plug-n-play installation (other than narrowing lower shock-eyelet). On 12mm threaded side of upper shock-mount, drill shallow 12mm hole to allow adapter to sit deeper and flush with surface.
Here's some related threads:
https://www.ninjette.org/forums/showthread.php?t=214238
https://www.ninjette.org/forums/showthread.php?t=170747