I am having a heck of a time finding a 4D55 cylinder head for my 1983 mitsubishi 4x4 diesel truck. She's a great truck... can't wait to drive her again! The injectors got changed in '84 from 24mm to 18mm... If I find an '84 or '85 head I will have to find some 18mm injectors to go with it. Help! Help!