Impact KCP-200B Grip Head for Lights and Accessories - 2.5" Diameter (Black) ($38 new)
mounts lights, light modifiers, scrims, flags, cutters, and other lighting accessories onto C-stands or butterfly frames.
Wide compatibility with standard grip equipment; fits 5/8" baby-studs or stand top-studs
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Trumate BoomMate BPH Boompole Holder V2 ($60 new)
for mounting boom poles on a microphone stand or lighting stand.
attaches to standard grip heads, which allows mounting on light stands or C-stands. The V2 model is 4" shorter than the original, thereby shifting the load balance forward for increased security when the boompole isn't fully extended and enabling easier transport between gigs.
Made to Mount on Light Stand or C-Stand
Sold as combo for $89 if you were to buy them brand new.