Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4655009.

I needed some diff retainers for a set of AR-60 axles I am building and only had some smaller ones from an SCX-10 that wouldn't fit. These fit the bill nicely. Printed solid in PLA at 215C.

Edit 11/16/20: I realized I juxtaposed two measurements in the original part. Fixed and re-uploaded.