"Westerfield featured HO scale models of the R-30-5 in both pre- and post-1911 Safety Appliance Act versions but these currently are out of production. These were kits 4903 and 4953, respectively."
Andrew Dahm from Westerfield replied...
"...the Westerfield Kits in the #4900 Series are still available but discontinued.
There are 23 decals left, so I can make 23 Kits in any of the 4900's.
After the decals are out, then they are unavailable."