Filter is installed in the cavity found after the blower motor is removed, filter needs to be compressed, inserted diagonally and rotated, you will probably just have to fiddle with it as I did, and yes, EV filter is the only filter option that exists. The EV service manual for R&R the filter is online; I found it by accident back maybe in April.

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2004 Ranger FX4 Level II, 5R55E, Sonic Blue Pearl

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