Hi, Andrew. The WIX number is 51516. Napa Gold is nearly the same number and equal quality. FRAM is not a product I'd ever use. Other opinions may vary, etc etc. >I have a spin-on oil filter on the latest TR3 and see that Moss recommends >K&N 235-830, Wix 235-855 or Fram 235-880. Terry Smith, '59 TR3A New Hampshire