Thank you all for the comments and offers.
Started contacting local grind/machine shops Friday to see if anyone wanted to take this on. After the the three shops I contacted were closed, I realized Monday was a holiday. And they started the weekend early (the curse of being retired, every weekend is 3 days).
Stopped by a jig grinding shop Tuesday morning and chatted with owner. He was concerned that the snap rings weren't perfectly flat and wondered if the mag chuck would hang on to them. He went out to the shop, and when he came back, 10 minutes later, he said they would be done in another 15 minutes.
So, starting with a 8A-7064 snap ring and grinding to .063" thick creates a C6TZ 7070-B equivalent.