whats a '67 r/t space saver tire

F-bodies had them, too. As well as AMC, Ford and some GM cars. You need to do a little research and find out what application it is actually for. I believe 14" and 15" tired cars had different size tires on the space-saver also. All these factors determine value, which will vary greatly depending on the application (thus the demand). If it's correct for a '71 'Cuda and in nice shape I can sell it for you as I have a friend looking for one.
Dallas