Long Post Guide: Allows water level more fluctuation than the regular post guide. As water level changes, the distance to and from shore changes.
Use 1.5″ schedule 40 Galvanized Pipe driven through the opening. When water is high, pipe would go nearest the shore end of this bracket and with water low, the pipe would be away from the shore end of the opening. The longer hole prevents the opening from binding on the driven pipe as the ramp pulls the dock in when water level goes down.