I just discovered that my passenger (right) side, side view mirror seal has a slight tear at the end of it. I could live with that, but this tiny tear is causing an annoying whistling sound on the highway. I looked up the part (AG43F21510AA) and it is $411 plus shipping.

I know it is a long shot, but does anyone know of a cheaper source for this?

$411 for a 6 inch piece of rubber seems a bit, uhm, much. I'm tempted to try to repair it (and save the annoyance of having to take the mirror assembly off as well).

 

The side mirrors on my 2006 DB9 are identical to the ones on my daughter's 2000 S-Type. Is this what you are looking for (but for the right side)?

https://www.ebay.com/itm/387584547957