I've got an old set of JBA long tube headers that have long been discontinued that fit a 67-70 Mustang w/ 351w and J302 aluminum heads that had off-set bolts and a slightly raised exhaust port. These headers would be good for a flange swap for larger exhaust port heads or aftermarket heads. The primaries are 1.75" with a 3.5" collector. They are in very good overall condition with just a few minor dings. Asking $50 + shipping O.B.O. Feel free to PM me with any questions you might have.