Early A Wagon Roof Rack

I have a 65 Dart wagon and also have a correct luggage rack (commonly called a roof rack) for it. According to the figures I have, 3847 slant and V8 65 wagons were equipped with one as an option (about 1.3% of the total wagons produced in 65). FWIW I estimate similar numbers for 63, 64 and 66 wagons Thoughts on using it?
What is your source for this data? I have lots of questions about my wagons rare or not options. THanks