Not as such, but you can buy the required winch, a suitable winch pad (angled) from winch supplier, some monel rivets.
All you then need is to drill the holes with a suitable drill and beg/borrow a rivet gun.
I must say I prefer halyard winches on the cabin top where they are accessable from the cockpit. However.... Aluminium heavy sheet can be bent up to make a flat bracket to hold the winch. Note it is important that the rope arrives at the base of the winch from a direction lower than the base by a few degrees to avoid overides (described as if the winch were on a deck). good luck ...olewill