Lock Knob for Interior Sliding Door [Vanagon]
This is the little bugger that you flip up and down from the inside to lock the sliding door. They have a tendency to loosen up over time and disappear. If yours is still there, get a flat head screwdriver on it and tighten it down before it runs off! If it's already run off... well, we've got you covered!
Fits: All 1980-91 Vanagon