Choco Dolly....
Sam, I too am looking for a chocolate brown caster set for my D2. Seems that , from what I have amassed, the plastic that they used for this run was either cheaper, or molded thinner than the earlier style. NO one, has one, or even can remember the last time they saw a Chocolate D2 with it's orig dolly; or are unwilling to part with one, as it goes to their machine, and certainly KNOW that it's a rare find. Most are sitting on the later D3 bases according to my many sources. I'm at the point of just acquiring a earlier base, and do some shopping for color match paint, and just spray up one. At this point I'd have better luck getting zapped in the buhunkas by a bolt of lightening, then finding one. 
Chad