We have a 2015 DS 4018. Headlight assembly is from a Chrysler Town & Country. Vendor Part # - 333-1185L-AS – Driver’s Side, Vendor Part # - 333-1185R-AS - Passenger’s Side. Amazon Part Number: 5113336AF, CH2503192, 114-01110R from DIT Parts, Inc. You should be able to cross reference for more part numbers. Bought 1 set for spares in the aftermarket, I paid approximately $120.00 including shipping. The spares came with H11 lamps in them for both high and low beams, so I don’t think Newmar did that. Checked prices recently and they have increased quite a bit. If you search the internet you may still be able to find a deal.
Hope this helps, good luck!