Yes, Cameraquest offers two pricing levels on the screwmount adaptors; "generic" and "Voigtlander" brand. Leica-branded ones can be had elsewhere for about twice as much.
And to address an unasked question, the three focal length variants of the adaptors only differ in which viewfinder framelines they automatically invoke on bodies that have this convenience. For the Bessa-R and R2 the frameline switch is manually set, so it makes no difference which adaptor you use with any lens.
With few exceptions it is generally safe to assume that any Leica thread mount lens will physically fit any thread or bayonet-mount body. The RF-coupling is slightly different on Russian/Ukrainian cameras (I think they don't have a roller on the coupling arm) and there's a similar difference on Leica CL bodies, with the lens's cam cut differently. They may work on roller-equipped bodies but I hear they sometimes don't.
Another issue is clearance for the meter arms of the Leica M5 and CL, which have a pivoting post bearing the meter cell that sticks up into the way of any lens with elements projecting back far enough... or any lens which can be collapsed when not in use.
Cosina/Voigtlander's evident intent with their RF lenses has been to address as much of this niche market as possible. As mentioned on the information-packed site http://www.cameraquest.com/
even the 12 and 15mm Voigtlander lenses can be safely used on the Leica M5 and CL without intefering with the meter arm.
So, unsurprisingly, I find the 15mm fits and functions just fine on my M2 and Minolta CLE. :-)