You may be able to buy the Top from Shell Valley who took over Midstates.
If your looking for accurate period correct stuff like Dash, Rollbar, Quick Jacks etc.. Then Nick Acton with Acton Custom is your man. His username on here is Mickmate. If you want to see what his Dash/Rollbar looks like on a midstates then check out my build thread here:
Midstates Update !
Thanks, Mike