missing piece 1984 jetta

We are working on a 1984 Jetta for a customer he decided to start doing work himself before bringing it in there is a piece missing on the bottom of the transmission in the middle looks like a bolt pin or maybe a spring loaded detent that goes straight up from the bottom it is a 5 speed standard can you tell me what it is and where I can get one Thanks!

David Oryschak
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so did you end up finding your piece at a dealership or salvage yard???

I ended up machining a new one thanks for your reply