I bought this here on E-bay, Then I checked into K&Ns' warranty.
They stood behind my old filter, so I don't need this 1.
It fit the kit I have on my 2001 Silverado.
When I bought it I was told--

"You are bidding on a used K&N Air Filter RF 1041.  This air filter saw less than 500 miles before being removed, as you can tell by the original filter media and chrome still looking nice. When it was removed it was in perfect operating condition."

After looking at it I think its more like a thousand or so, but  it is pretty clean.
The one side has some dented ribs, but not bad enough to reduce its function.

Air Filter Large End Diameter7.5 in (191 mm)
Air Filter ShapeRound Tapered
Base Outside Diameter7.5 in (191 mm)
Filter MaterialCotton Gauze


Flange Inside Diameter6 in (152 mm)
Flange Length1 in (25 mm)
Flange TypeCentered
Flanges1
Height7.5 in (191 mm)


Product StyleRound Tapered Universal Air Filter
Top Material/FinishChrome
Top Outside Diameter5 in (127 mm)
Top StyleMetal
Weight1.8 lb (0.8 kg)