I have looked at all the local parts houses and all I can find is a listing for a fram, but the store warehouse is out of stock. The manufacturer is no longer making an oil filter for this truck. I have another oil filter housing from a D50 that takes a smaller filter (available at NAPA), but it was damaged in a collision (I got the engine from the damaged D50 for my Mits). I need to use the larger filter. I have searched this forum, but have only found numbers for the 4D56. Are the filters the same? Any help would be appreciated. Thanks, Rollguy (the Diesel guy)