DMT Mopar Heater Box Rebuild / Restoration Gasket Sets & Gaskets
Heater box restoration kits contain all the seals, foams, caulks, etc necessary when restoring a heater box. Most kits come in two sizes
Basic Kit - containing the basic seals, foams and caulks
Big Kit - which contains any additional items that we offer for the specific heater box like screw kits, new rubber blower motor cooling tube, new firewall grommets, heater box clips sets, etc.
E Body AC Heater Box Rebuild Tech Info
Link to a great step by step rebuild of an E Body AC heater box. 71-74 B body AC heater boxes are nearly identical so this helpful info would be the same.