These are the rubber bumpers that go between the fan shroud and the radiator to hold it in the core support. Since there were many radiator options these were different length to fit the end tank of the radiator.
1976-1978 C3 Corvette Radiator Core Support Late (2nd Design)
Used 2004 Honda Civic RAD SUPPORT,HYBRID 60400-S5B-E10ZZ 60400S5BE10ZZ. Purchase from http://www.ahparts.com/buy-used/2004-Honda-Civic-Radiator-Core-RAD-SUPPORT-HYBRID-60400-S5B-E10ZZ-60400S5BE10ZZ/49326-1?utm_source=pinterest
1968 - 1968 Dodge Super Bee B-Body Radiator Core Assembly
Radiator Core, 1968 Dodge Charger, Dodge Super Bee, Radiators, Dodge Chargers, Products, In Living Color, Radiant Heaters, Dodge Charger