"A" STANDARD DIMENSIONS: 3.500, 4.000, 4.500, 5.000, 5.500, 6.000, 6.500, 7.000, 7.500 (Other sizes available with longer delivery times.) REPLACEMENT THERMOCOUPLES ALL SIZES CATALOG NO. OCT-025-14 (Type "J") REPLACEMENT HEATERS ADD "H" BEFORENOZZLE'S CATALOG NO example:H-NCM100-20-40-01