New old stock.  Delta 3 belt pulley part number 428-06-130-0003.  .938" Bore, 3-3/16" diameter, 3/8" top of "v" distance.  List price $202.57. Fits:

Delta 22-650_TYPE_1 PLANER

Delta 22-650_TYPE_2 PLANER

Delta 22-655_TYPE_1 PLANER

Delta 22-655_TYPE_2 PLANER