Abstract: There is disclosed a mechanism for retaining an automotive radiator rigid, including sleeve members mounted on oppositely disposed portions of the radiator and an interconnecting rod member. Arcuate-shaped edge portions are formed on oppositely disposed portions of the radiator, each of the sleeve members having longitudinal bores formed therethrough and including arcuate-shaped groove bottoms opening in a direction generally parallel to the longitudinal axis of the sleeve members matching the arcuate-shaped edge portions and being slidably mounted thereon so as to have the bores thereof aligned. A rod is mounted across the radiator and extended through the aligned bores and secured therein by nuts mounted on the threaded ends against the respective sleeves, to thereby rigidify the radiator for use on trucks and off-highway vehicles.