If your Syncro came with a front differential from the factory then your van uses this plunger. This plunger actuates when you pull and rotate the differential knob to lock the front diff. These do...

Windshield wiper arm nut cover/wiper cap. There is one cap per wiper arm:  One in each front wiper and and one in the rear. Sold individually. Two different angles are pictured. Ref ID: 133955435

This stainless steel locking diff actuator bracket works for both rear and front locking differentials in the VW T3 Syncro.  It is equipped with mounting provisions that make it compatible with...