They're all clear. Tamiya is the only one making medium wheelbase bodies.
Here's a link because you've got to do
some of the homework on your own. Go through each of the listings and if they say 225mm wheelbase or medium or m03m or something like that, you're in the ballpark. This is probably the cheapest place to get them, minus shipping.
EDIT: My bad. Ride, Speedway Pal and Shun are also doing medium wheelbase shells. I'm surprised.