3" Stationary Keel Roller Assembly f/3" Tongue. Product Description. Stationary keel roller bracket assembly for a 3" wide tongue. Bracket. 1/8" thick Galvanized. 5/8" shaft. 1/2" hole slots. 3" hole centers. Replacement part #32151G. Roller. Black natural rubber. 3" Diameter. 4-7/8" wide. 5/8" shaft. Replacement part #29522