Andy, did you try John Fowlie (Big M Auto)? Also, if you can dig up the P/N, you might find NOS from Glen Dawson or (*gulp*) AMS Obsolete (formerly Frank Mitchell, very pricey...)
If I can find time this evening, I'll try to look up the part number and run it for you.
Andy, from what I can see - thisis the part you need (even number, for the passenger side):
Unfortunately, I've searched my online sources for NOS, but I'm coming up empty. Dick Koch has been known to fashion replacement trim from other pieces - I wonder if he could help you out? Not before he finishes Martha's trim, though!