Swapping to a four core radiator is the easy part; holding it in place is where people improvise. The heavy-duty upper retainer is a different stamping than the standard two and three core piece, and using it means the radiator sits at the correct angle with proper clamp force instead of leaning on the shroud.

Auto Metal Direct 349-4067-1H Upper Radiator Support Features:

• Fits 1967-1972 Chevy and GMC C/K Series trucks.
• Fits 1969-1972 Chevy Blazer and GMC Jimmy, and 1967-1972 Suburban.
• Upper position retainer, correct for heavy-duty four core radiators.
• Stamped from heavy gauge steel with a corrosion resistant coating.
• Indexes to the original mounting points, no drilling or trimming.
• Sold individually.