I have primarily used Google Image, and E-Bay Motors. That in turn leads to my Fotki albums, because photos on the internet may be there today, yet not necessarily tomorrow. I have catagories for almost every brand of vehicle, and most albums have hundreds, if not thousands of pics. Most photos are captioned by make, year, model. Many of the albums are then arranged by title (the default is upload date). This in turn makes finding a photo of a certain year easier. Of course, captioning every photo takes time.
I have also indexed my magazine in Excel, but I let that go years ago. Sadly due to overcrowding in my hobby room, some of those mags may end up at the landfill.