Just like the VW originals, these wiper arms don't come with splines already cut in the mounting holes. Once you bolt them down for the first time, the grooves in wiper pivots create grooves in the...

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

Rear wiper washer reservoir. Fits all vans with rear wipers. Does not include cap but you can order yours HERE Ref ID: 251955453E