I'm wondering if the cylinder heads are stock on my mustang, or if i just had an off-year or something. I went to buy some spark plugs and the motorcraft ones that i got for my model year didn't even screw into my car. The spark plugs i took out were Autolite 2545, and i went ahead and bought some knowing they'd fit. They look different than the ones that "belong" in my car, with the motorcraft plugs having no distance between the thread and the electrode while the autolite plugs have roughly 1/4 inch of space. I tried cross referencing to find what heads or what might belong but i came up with nothing. This isn't an important issue but it's puzzling me and I'd like to know what I'm working with.
Edit- VIN is 1FABP42E5HF250403 if that may help
Edit- VIN is 1FABP42E5HF250403 if that may help