Part numbers for E Class Cabriolet (A238) Wind Deflector 'plugs'

[CabrioChap]

I have a 2018 E Class Cabriolet and have purchased a used Wind deflector. Unlike my previous A207 cabriolet, the mounting plugs for the deflector are not pre-installed.
So I need to source and drill holes and fix.

I can buy the plugs from cabriosupply.co.uk, but £50 seems a bit steep. If I knew the part numbers I could try my local dealer instead.

Parts are numbered 20,21,22 in the diagram. The Wind defector is number 19. (it's the same deflector for the A205 C-Class, so has an A205 part number).

 

[CabrioChap]

I found them..

1 x Air Deflector Pivot, Left: 205-868-01-00
1 x Air Deflector Pivot, Right: 205-868-02-00
1 x Air Deflector Cover, Left: 238-868-09-00-64
1 x Air Deflector Cover, Right: 238-868-10-00-64
2 x Air Deflector Bolt: 001-984-66-29

I can't say I am looking forward to drilling holes in my new car, but I've always had wind deflectors in my convertibles and the thing is made to fit behind the rear seats.
Seems odd that Mercedes didn't fit these from the factory for the UK..