You would think so, wouldn't you, yet this part is amazingly hard to find.

For the custom solution, I have found (after an amazing amount of searching) this can be done:

1. Call Becker autosound (http://www.beckerautosound.com/parts.html)

2. Ask for part number 1319.116-276 (it's about $9).

3. They ship you all the pieces you need to make your own RCA inputs for any Euro headunit that uses ISO plugs. I got the kit today and snapped in the RCA inputs I needed in about 30 seconds, and it feeds into the Blau head unit perfectly.