Presently, I use a camera to capture the image and document my project. The 7000 Series line was manufactured from about 1970 to 1995. It is difficult to pin point when a particular product was produced. Up to top 2. I found a 7603 oscilloscope being sold by a private party.
Most mainframes support most plug-ins.
Take a look at 7000 Series Oscilloscope History to see if any exceptions are listed. Once you know which products fit your needs, there are several sources to contact to find those products. Below is a list of a few of the used equipment dealers. You may know of one in your area. Check the ads in magazines like Popular Electronics.