Ron,
I couldn't find the Motorcraft FL-786 in my book, so I don't know if they will work.
But I do know the Napa 1182 (same filter as the Wix 51182) and the Napa 1324 will work on the DaeDong 35 and 40 HP engines.
The direct crossover for my DK 35 is the Napa 1182/Wix 51182, but they are slightly larger in diameter and lenght than the stock DaDong filter and I'm pressed for space so I run the Alternate (Napa 1324) which has similar specs but is a bit shorter than the 1182.
I hope I'm making any sense /forums/images/graemlins/tongue.gif