Well here’s what’s inside the suppressor... It’s a 120 ohm, 1/2 watt (I think) resistor in series with a 1uf snubber capacitor. I believe the part number is actually 105MWR400K. Or at least that’s the closest I can find to what’s printed on it. That’s a 1uf cap rated for 400vdc at 105 degrees C. Digikey has plenty in stock right now.