Using the Penn State Electrostatic Filter on Jet Model AFS-1000B

I have the Jet Model AFS-1000B and it is time to change the prefilter.
Jet gets $30 for a disposable prefilter and Penn State gets $35 for a washable one. 2 questions, is the Penn state a full 12" or is it 11 1/2" like the Jet? does it perform as well as the disposable filter?
thanks for any and all assistance,

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