Hi Derek,
Here's another small contribution for your UREI data base collection (pic attached). There's no glamour in such JBL listings, only a bunch of numbers. The info shown is likely for the models still available at the time of printing, mostly the C series you were looking for. I covered the rest of that page since its not UREI stuff.
Note regarding such listings. Generally, the UREI data is way down at the end of a list, with the column headers on page one only, e.g. for a 6-8 pages list. Say you're on page 6 and ask what was column 5 about again? Well you gotta go back to page one to know, so keep going back and forth to consult such list, a pain in the ass. However the list attached has the UREI stuff at the beginning (rare) with the column headers just above, nice. Therefore it was easy to provide this one to you, but not necessarily the case for other lists...
Some of the numbers on the present list look like part numbers, e.g. 45-0113 and no description other than the column header. To maybe provide a little more item description i'd need to cross-reference this list with other ones i have to hope getting more meat. Unfortunately i don't have time for such a search.
My suggestion for possibly more description than a header/part number only would be for you to ask member(s) here having a connection/link with the JBL Parts Dept, i don't. I'm guessing there should be a short item description in their system corresponding to a part number (e.g. UREI 15" coax driver, or something similar).
Hoping this will be useful. Have fun,
Richard