I'm replacing an adjustable wood (oak) threshold, just the oak wood adjustable portion, but I have been unsuccessful in finding the OEM adjustment screws for the replacement. I think the door was made by Reliance but I'm not sure, I have the size of the screws and I could retrofit the screws by reverse engineering them, but I would prefer to use the OEM screws rather than retrofit my own. Does anyone know where I can find those adjustment screws? I'm sure there are different OEMs for the screws since every door manufacturer seems to use a different size screw.