I bought a newer H21 hopper and it came with metal wheels and body mounts.
The new run of the Bowser H21 and the GLa hoppers both have body mounted couplers (not MT or Accumates) and FVM metal wheels. They messed up with the GLa at least because the wheels now rub somewhat on the body slope sheets. You can get around it by a thin washer (be careful you don't break the bolster pin) or swapping FVM
thin tread 33" wheels (Bowser used the thick tread) or by grinding off just a hair's of the slope sheet and touch up painting.