Bikemonger says... At last, a nice Campag converter kit. We used to tell people to get a Shimano wheel when converting Campag'd bikes, we then had some spacers made up in Colorado which were not cheap, and now Gusset are on the case.  It looks good, and has all the features you need .

Gusset says..... The Double Six C single speed kit is a premium level kit featuring a 10mm wide spline base Campagnolo fit cog to ensure power transfer doesn’t score or destroy alloy freehub bodies. This kit will allow you to quickly convert your wheel to single speed without the need for a new rear hub. Our tapered spacers are designed to offer increased lateral support for the cog under load.

This kit is supplied with:
18t CNC and drilled Chromo 5/64’’ cog
2x CNC and drilled alloy spacers with laser etching. Different thicknesses for chain line adjustment.
Lock ring

Campagnolo 9 speed onward compatible only.

16/17t cogs available separately.