Sorry, I just saw your post.
I replaced it with a double DIN.
I believe there are some aftermarket facias for a single din conversion that fit in the
stock location and just blank of the extra space or put a small pocket under the single slot.
Unfortunately it was so long ago now that I can't really remember much of what I discovered while researching the idea. As for the install, thats a bit hazy now too, but I do remember that by far the hardest thing was getting the silver plastic surround off because of the black plastic piece that covers the back of the air-con computer.
I'll see what I can rustle up for you.
Meanwhile heres a pic of my Clarion six disk in-dash player: