Apparently there are only two date codes available on heater hoses for a 1970 428 CJ mustang. These repro hoses are with the red Autolite markings, strips and grooves.
Available date codes are H9H04B Nov 4, 69 and H8H02A Nov 2,68. My car was Dearborn built Sept 4, 1969 so would the H8H02A hose be correct or is the H9H04B correct as the vendors are saying that the later is for a 1970 mustang built before Jan 1970. The H8H02A hose marking seems quite early for a 1970 mustang and vendors are designating it as correct for 1969 mustangs.