The MTL kits include the horizonal braces, air tank and valve and the stirrups. I'm not sure if they included the cylinder. They don't have the diagonal slope sheet braces, the vertical brake rod or the levers from the cylinder.
Atlas's recent 2-bay offset side cars do include the diagonal slope sheet braces, the air tank, valve and cylinder. The vertical rod is molded on the body. The only thing missing is the levers from the rod to the cylinder.
The new Bluford Shops cars have all of the above as you can see in the photo. I must tell you, it took me a good half hour to assemble the parts you see in the picture.
We'll look into the practicality of releasing them as separate parts.
Craig
www.bluford-shops.com