Never encountered a roller and track difference. All the after market rollers I have added fit in nicely and they were much older than 74.
You know, I would continue my search for that right size roller. they just have to be out there. Consider doing a search or go to overheaddoor.com and ask them.
You know, if you cannot find that correct rail size, you have only two options: install a new rail on one side only, or get a new system.
© 2016 Renovate Your World LLC