I am having trouble finding what part number to order off Amsoils website. I use a filter that is Larger then the OEM filter for my vehicle, 2003 Land Rover Discovery II 4.6. I know that the M1-301 and K&N HP-3001 filters fit my vehicle. However I tried to cross reference a few other filters, AC delco/fram, then cross reference those part numbers off the Donaldson website. But the part numbers I found off the Donaldson website are not listed on the Amsoil Endurance Filter list. Hope that wasn't too confusing. So, how do I get a Donaldson Endurance filter that is equivalent to the M1-301 and HP-3001? Thank You.