These are nice quality, heavweight footrest rubbers - embossed with VINCENT in their centres, as per originals. These fit both rider and pillion footrests on all Series C and D models. Sold as pair
I used the same rubbers on my Vincent Comet when I restored it.
By the way - these sometimes come with a slight white residue on the surface, this is just the mould releasing agent and can be easily wiped away with a damp cloth before fitting