This is what it'd look like if there actually was an interchange and they had a proper interchange. I worked with the exact interchange system for 14 years. Car-part is just a website so public joe blow can look up stuff online rather than calling around. They use the eden/hollander system for the interchange.
Hope I don't come across as too much of a dink but that could screw a lot of people if they don't know how to properly use that site.
I stole this from http://car-part.com/buyerfaq.htm
Why am I asked to choose a year range?
If the part you are searching for does not have interchange, you will be asked if you want to search for your exact model or search for parts in similar models. At this stage you must also specify a year range. The year range default will be only the year you searched for. If you know that another model year will also fit your needs, you can expand the year range search. Prior to buying your part, you may want to contact the recycler to verify this is the correct part for your vehicle.
How will I know which year range to search?
You may have personal knowledge of which parts will work for you, you may have a crash guide (such as Mitchell or Motor), or you may have an interchange manual (Hollander® or Mitchell) that contains the year and the range interchangeability. Car-Part.com has interchangeability built into the search engine using Hollander Interchange®.