Just picked up a Dealer spare.
My spare filter from CHN PN =
FILTER-MART CORP. P/N............... 28-0211
$8.70 plus the shipping
will be @ the same as the @15.47 at CNH dealer
I keep a spare, it needs changing between 200-500 hours of use. I was doing a lot of bush-hogging and found mine needed it in less @ 100 hours. But that was likely much harsher conditions than most Dexta's will see.