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Hello Joe, the size of the filter should be on the edge of the filter, look there first. Buy the replacement rated at 30 to 40% efficiency, if there are no dimensions, measure the filter for me and I will help you make a selection.
see page 37
We can go from there.
Those furnaces can be fit to take a range of different filters, I could not find the manual on your particular model.
Regarding filters generally almost any filter that will fit in the space tightly will work in the furnace as long as the dimensions are the same, your furnace might even be able to accept Tranes 4" thick filter for much better performance
Its a bit like tires on a car, you can order the car with a wide range of tires, the only thing in your case that has to be the same are the dimensions.
Get me those and I will recommend a range of air filters after asking you about any allergies conditions in the house etc,