81 240D 315k miles

well i went in to figure out why i could not unlock my door and the key would just spin. there is a sily white plastic insert in the steel lock mechanism that broke. It looks a bit like a funnel with a bar across the wide end that engages a lock lever. I glued it back together with epoxy resin, but I can just see it failing and locking me out in the rain. Is this $.04 part available (couldn't find it on fastlane) or do I have to junkyard this? 25 year old donor part is not much of a confidence builder.

anyone addressed this?