Just got an order for a complete replacement set of rings for our Solar Ride here. Some of the rubber on this machine may have been original - which meant stiff, cracked, and generally not the best stuff. Plus two of the rings were BLACK replacements - ick on several levels.
The manual called for white rings - we went with clear for everything, partly to help the GI on the playfield (now LEDs), and partly because I wasn't sure bright white rings would have looked good against the patina on the playfield. It looks pretty good. And it plays a lot faster than with that old, stiff, cracked up rubber. We even replaced the shooter tip and flipper rubbers, but those were done in the original colors.