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At the moment, I can't think of anywhere the factory uses such a piece. Anything loose on any of your lawn equipment?
the only thing up front that would even be remotely close to a snap ring like that would be a oem external transmission cooler. if your truck has one you could easily verify if yours are still place by just looking with a flashlight
You load any of your music gear in the back? I could see a snap ring on some drum hardware.