I HAVE 2 BAZZAZ QS4 QUICK SHIFTERS FOR MULTIPLE YEARS OF GSXR 600 750 1000 AND 1300 HAYABUSA THEY ARE BOTH STAND ALONE QUICK SHIFTERS $215 SHIPPED OBO.
From ‘06-‘20 gsxr600/750 should be compatible. All the connectors are the same. I bought a used zfi that came off an ‘07 gsxr600 and installed it on my ‘19 750 with no issues. If that helps.