the new blend door acctuators come with the new electric motor and arm as one unit. the old style accuators you could pull the arm off the motor assembly, but they redesigned it so you cant now, it also made it stronger, so you need the blend door assembly, which will come with the new arm, contact Max at 5 Star Ford in Scottsdale Arizona, he is a vendor here on this site, he will set you up with the part for under $40 bucks, and if you guys can tackle the job yourself it wont cost you a dime more than the part itself. Ford charges 8.6 hours to do the job, which is roughly 800 bucks or better for labor, i can change a blend door in 90 minutes, so you can see how screwed you really do get!!! its not a hard job its just time consuming.