Well, I've been looking at pretty much all of the slider brackets that I can find to see if these would work with them and I have found nothing similar. I would love to use them, seeing as they are already installed, but I guess they must be from a product that has been discontinued or something to that effect. If anyone has either seen these or have something similar on their boat, I would love to hear about it. I dont know if these came on the boat originally or not. It is a 14' Traveler by Sea Nymph.