Just went to Toyota Parts East to double check before posting a link and "poof", gone. I hate that when it happens.

Just like you said. The front is no longer available and the back is still in stock.
Went to CCOT and they do still have them. Both front and back. Back isn't too pricey but the front hurts. This is the kind of stuff that kills you when you are trying to piece one of these back together but it's not like you have a lot of choice but to pay it. Anyway, here's the link.
http://coolfj40.stores.yahoo.net/lightmarker.html
When I first started putting my 55 back together, the original radio was listed as available. I figured I would pick one up when the time came. The time came and they were no longer available.
Sorry for the confusion with Toyota Parts East.