20x12x1/2 Inch Pre Filter F50F - High Efficiency Air Filter Replacement for HVAC Systems, Furnaces & Air Purifiers - Perfect for Home, Office & Commercial Use

I have had a lot of problems getting the 203372 filters. My furnace air cleaner (Honeywell F50 F 1065, from 1998) requires the ¼", or close to it, and mostly I am finding the ⅝" filters masquerading as the ones I need. I called Filters America, and Anne Marie answered the phone, and went into the warehouse and MEASURED the depth of the filters, which let me know that I had the ones that would fit. This is the second time I've bought the filters from them, and I'm so pleased.