whats up homie? well I live here where freeman cars is and the last time I went to his shop he was working on 61'62'63'65' impala wagons. he already has the 64' but I havent seen anything yet. I just saw the masters that some dude gave him to work with.
Modelhaus.com got some wagons, 65 and 67. He makes great stuff. the 50 Suburban was made by Showtime Resins, but I think he's taking a break from casting for a while. And I always tell people this: Ebay!
There's a guy making a 50 panel though, he's sells on ebay sometimes, I can try to find his email.