[68 Caretaker]

Took the engine out of my 68 to do some cosmetic work. Knowing the whole history of this car, I thought I would replace the original heater core. Ordered one from Ames for a 68 and they sent one for a 69-72. Mine has a straight lower tube, not the 45 degree tube. I called them and was told that early 68 used a different core that is not available. My upper tube is slightly crushed from changing out the old hard hose years ago. After looking at core dimensions for a 67, I think it might fit. Anyone know if a 67 is the right one? My firewall doesn’t have the oval hole for the angled lower tube.