the 78 Mustang ll I am building my son I cut out the rear spare tire well and surrounding floor, fabricated a square frame with 2"x2" square mild steel tube to fit between the rear frame rails, welded that in and bought a 1967/68 Mercury Cougar gas tank to fit in that opening, also used a 2 1/2" hole saw to cut out for the fill tube to go behind a 67/68 cougar pull down license plate holder and fill neck tube, hole in driver rear quarter is deleted, cougar tank is 16 gallons, mustang ll tank is 13 gallons
the 78 Mustang ll I am building my son I cut out the rear spare tire well and surrounding floor, fabricated a square frame with 2"x2" square mild steel tube to fit between the rear frame rails, welded that in and bought a 1967/68 Mercury Cougar gas tank to fit in that opening, also used a 2 1/2" hole saw to cut out for the fill tube to go behind a 67/68 cougar pull down license plate holder and fill neck tube, hole in driver rear quarter is deleted, cougar tank is 16 gallons, mustang ll tank is 13 gallons
you can even upgrade to a 69/70 cougar gas tank with 22 gallons
Chassis connectors