wrong injector??

I'm starting a new post, and of course it has something to do with injectors. I've been trying to cross-reference this new injector, that I bought and can't take back to the store, to make sure that it's even the right injector. When I typed in the numbers, I got a site that says that the injector I bought is a 36 lb "Blue Top" injector (Ford Super Coupe). When I try to find the part number for the injectors that came in the truck, I'm finding totally different numbers. When I went to Car Parts America, it says that the injector should be a F4SE-A1B instead of the F4SE-B1A which is the one I bought. Can anybody help me out with this one. I plan on going to a Ford dealer and asking if this is the right injector, but I figured I'd try here first. Thanks. Nate