I have a Toyota Pickup that I bought in '91 brand new. Its 4WD, manual, extended cab, manual windows and locks, with a V6 3 liter. I am wondering if it is an SR5 or a Deluxe model. Is it possible to not be either? What are the differences? I noticed there are different stock decals on certain trucks and different colors on the rear fender plastic piece, are these any indication of the model?