WANTED - Removable Casket Rack

I am looking for a removable casket rack on behalf of the Milwaukee Fire Historical Society. They are interested in obtaining one so that their 1947 S&S Cadillac ambulance can be used for firefighter funerals. Any leads appreciated!

One or two piece and what length? I currently have six different vintage skeleton racks available.

As someone who is more into the cars themselves rather than funeral equipment in general, I need to ask what is the difference between a one piece and a two piece unit? PM sent for additional information. Thanks!