Parking Pall Blues

My parking pall control rod snap ring has slipped again. I cannot find a replacement part anywhere. Does anyone have a source for it. If not, Any ideas on how to secure it so that it does not rotate and allow the control rod to fall off the plug and not activate the park. pic 3 is mine. Pic one and 2 are examples of bad and good. How can I get it to stay up?

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