If you want a large intake on both sides you can get the intake from a 560SL housing and replace the small one on the DS

https://www.ebay.com/itm/1986-1989-Mercedes-560SL-107-Air-Cleaner-Filter-Box-0140945002-OEM/332394818061?hash=item4d64466a0d:g:6bMAAOSwD9dZzXKw&vxp=mtr

That's what I'm doing on the custom 560 engine I'm building

Ignore the price-this was just to illustrate it

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT