If you will go to www.wixfilters.com
and click on "filter look up" then select "off-highway equip" and next "Allis-Chalmers" then "tractors-construction" finally select which of the six versions of HD11s you have you will find a complete list of all filters used on your dozer. NAPA numbers are the same except you delete the first digit of the Wix number. Instead of WIX 54321 for NAPA you would use 4321.
Bryce This post was edited by shinnery at 22:35:28 08/12/12.