So I finally got the other 2 pieces of 100pr last night and lo and behold, they have the violet groups. So the one piece without confirms there must have been a call director in that installation at some point. I never knew they made call director specific cabling, so that's kind of neat.

Sam, I'd be curious to know how you made your own. I tried doing it with a 66 block once, but it's a tight fit to cram diodes between the pins.