Scott's correct...there are several for the 5500 series alone....I should know, different motors as well.....
the only way most were interchangeable was to change the motor and board together, almost as a matched set...
although I was always partial to the "revved up" jet sound of the 3000/4000 series motor....a very quiet machine until the final spin, THAT got everyones attention!
video courtesy of our own Eddy1210