I'm currently putting headrest monitors in my 740 wagon, I have installed headrest monitors before but always on normal headrest not the funky volvo headrest so heres what i've done to make them work and very nice, i'm hoping to have them finished within the next couple days here some pics on how i did it.

 

should look pretty sweet once i sand the fiberglass and im going to use a textured paint base then paint it to make it look like factory plastic,