Hi! The came off a boat I had to scrap. Two have about 1/2" thick 3"x5" UHMW backing plates and two have round spacers about 1/4" thick (from the factory). Note that only 1 has the cover. These do require two extra 1/4" holes to keep the bracket from twisting. Mounts with about a 1.25" hole. Thanks for looking and
please examine photos and condition notes carefully to ensure this is
what you want. Also, please contact me if you have any questions.