Wiper arms with cover-caps

The wiper arm on the driver's side is curved towards the passenger's side.
The arm on the passenger's side ist straight and longer than the one on the driver's side.
Reffering to the blown-up drawing, the 328's wiper arms come with cover caps.
Nethertheless we have seen other models, like the 308 QV and 308 GTS, with caps as well.
- old DinoParts ID: EJ-EK-129-3,5