W212 door speaker harman kardon

[Darragh1]

Hello all,
When heavy bass dance music comes on i think i hear a blown door speaker part number A 204 820 21 02. For simplicity I might replace with an original. I wonder is it against the law of quadrophonica to replace only one side? Is there a supplier of these speakers so I might pay less for original?
Thankliest regurgitations,
D.

 

[AMGeed]

Ask a Mercedes breaker like Dronsfields if they have one.
Should be plenty of HK speakers from broken cars in their warehouse.