Many collectors have spent lots of time and energy (and have gotten really dirty) hunting through old vacuum stores for these old parts; have you tried calling around to any old vacuum stores to see if they by chance have some laying around? 

It would also be helpful if you would post photos of the brushrolls for which you are looking for new brush strips.  There were many different varieties of brush strips for Hoover models over the years.  The 62 could have the original style brush strips with one screw, or it could have "canoe" brush strips, depending on whether or not the brushroll was ever replaced. 

I am pretty sure it was on VacuumLand, where I saw someone re-bristle an old set of brush strips by hand, using bristles from newer Convertible brush strips.  You would have to search the archives, though, for that thread.  I think it was one of our UK members. 

I've given many sets of brushstrips away over the past 10 or so years, and most of what I have left are now being saved for the machines in my collection.  You just need to be patient, watch eBay, and be diligent with calling around to old vacuum stores.  Also, networking on a site such as this will help.  I'm sure someone out there will have what you need.  The Vacuum Cleaner Collector's Club is having its annual convention in Cleveland this year; that would be a great place to meet some of the other members of the club and begin networking for some of the old parts you are looking for.