This is the little black cap that covers the wiper arm nut on all VW Bus from 68-79 and all Vanagon from 80-92. There is one required per wiper arm.
Side 3/4 window seal for 68-79 VW Bus
Hazard Flasher Switch
Pillar Moulding Set for all Vanagon (black)
Vent Wing Seal for post of front vent wings VW Bus 68-79
Outside scraper with chrome molding drivers front door 68-79 VW Bus
Fuse 25 Amp Nuetral