Hey Jim,
The SS-1 was part of a system back in approximately 1957. You could start with what you have, the SS-1's. Then, if you wanted to go all out, you could add a pair of the SS-1b's. These were large, floor standing cabinets fitted with a Jensen 15" woofer and a Jensen horn super tweeter. At the time, it was actually more probable that it was a put together for a mono system. The fact that you have two is pretty darned cool.
The University woofer is something that someone replaced the original with. The system was filled entirely with Jensen drivers. You'll find that those little rigs don't dig very deep, and they don't go very high. But depending on what you're listening to, could be a very pleasant pair. I see the SS-1's come up on fleabay once in a while.
Ultimately, you'd want to find the matching Jensen woofer and replace the University. But at this point, who cares. You got the cabinets and that's what really counts!
Biggles