I bought them from bicycle motor works they are threaded on the bottom for a bracket. I dont know where the mounts went but they were pretty clunky and personally I would just bolt them onto a barnacle/fender mount or rack. I will take some pictures of the threads
With those big projector lenses I'd guess pretty narrow spot lights; but they could be (de)focused differently. Title says XT60, screenshot picture says XT90; which is it?