Unless , like Chuck points out, you're doing a complete replacement of the system, I wouldn't bother.
All I drive are antique cars. Virtually every one in the list you see below, with the exception of the Ford trucks, has single reservoir master cylinders. They all work perfectly. None has EVER failed on me in my entire life. The Cadillac has been my primary vehicle for over 20 years and the mc was rebuilt around 2002 or so and has well over 100,000 safe miles on it since. Add in another 100,000+ miles for the other vehicles and you'll see that properly maintained brake systems don't care whether it's single or dual reservoir.
Like most collector car guys who work on their own vehicles, I'm sure you pay close attention to every aspect of your vehicle and head off trouble before it starts.
No need to go looking for problems that don't exist.
