Here is an old list of available MILW cars... I badly need to update the User's Guide pages but most of my computer time goes towards work on the Passenger Car Photo Index... http://trainweb.org/passengercars/UsersGuide/MILW.htm
Now if only somebody would do correct decals for the 1952-era MILW passenger cars! So far, I've had no luck whatsoever! I even called the folks at Railway Classics and they had no idea either. Now if only IM would do the MILW FP-7's in their "as delivered" Hiawatha paint scheme.
Don't know if you have seen this yet. Con Cor Milwaukee Road Hiawatha Passenger Car Set - eBay (item 380016566574 end time Apr-17-08 16:14:36 PDT)
Your wishes are granted! Streamstyle Graphics has Milwaukee passenger car decals for all time frames and more. IM is doing the FP7's in the orange/maroon/black scheme. I believe they are due in April. Have fun