The two small 1 1/16-inch heater hose clamps are correct NOS clamps with a fourth-quarter of 1971 date stamping. The set of four larger 1 3/16-inch clamps are as close to what was on this car as could be mustered, complete with a very light gold dichromate wash applied here in the shop to at least make them look correct.
Reproduction heater hoses was ordered as well. These are supposed to be ribbed and marked correctly with two-letter broadcast codes for the car. Lots of vendors offer a popular and attractive set that bear the GM logo, but they are not correct for the Corvette.
A set of correct radiator clamps will be tracked down and purchased next as we continue to save for the engine rebuild.