need help! where to find bumpers for 1968 ford galaxie xl fastback or will a bumper from another model fit the 68.....

Time to look for magazines like Hemmings Motor News, or any publications dedicated to Fords. With a car like that you might want to join a local car club, or even a national one. These are invaluable sources for rare parts and people who specialize in these classic beasts that we all try to keep in cruising condition.

Try eBay and Craig's list. Also, Google Texas salvage yards. There are a lot of them that just have loads of old cars just stacked up. Watch some of the car shows on Velocity channel as they are always going to some yard for parts.