Go to the magazine rack at the store .... get a Mustang magazine /// Walmart has a large selection then inside you'll find over 20 top aftermarket part houses in the US including Year One but Year One isn't the best price. all have sites .... Trust me on this one This first step is important ...Don't eat up all your time on the Net //// Plus the Magazine knownledge is worth it
make sure it's a MUSTANG magazine ie only mustang support
I used to work at a public library, a couple of them in fact. They all had a section on car parts and what gizmos go where in the car. These things were easily as big as telephone books! So, even if you managed to get a book like that for free (which is unlikely) the shipping would likely be way up there. I’d suggest going to your local library and looking for some books on the subject there. If you can’t find them I’m sure there’s a nice grumpy old reference librarian there to help you find it or something similar.