Kawasaki Vulcan 900 Custom Bar Risers.
50mm handlebar risers. Made from 304 Stainless Steel.
They are designed to screw on to the handlebar thread and you bolt a M10 x1.25x35mm long bolt up through the triple clamp into the riser.
I suggest you use these bolts or similar:
https://www.repco.com.au/parts-service/fasteners-and-fixings/nuts-and-bolts/champion-hex-flange-bolt-nut-high-tensile-m10-x-35-x-1-25mm-14af-grade-8-8-fbm106/p/A8792367
Costs $99 for 50mm pair
No other hardware supplied.
May fit other model bikes.
Happy to organise freight for all Australia and overseas(extra).