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#771 - HDR: 29 7/8" X 6 1/4" - 42 BH - 13 lbs. ( 29 3/8" X 6 1/4" on grille side)  
GMC cross flow tank

This tank has a 2 3/4" diameter hose connection. The tank header tapers 1/2" from the engine side to the grill side on the end with the hose connection only.
#770 - HDR: 29 7/8" X 6 1/4" - 42 BH - 13 lbs.  
GMC cross flow tank

This driver side tank has a 2 3/4" diameter hose connection.