well the guards on the 323 and the 326 and so on etc. are the same on all 300 series I belive what you have seen when the dealer got you the 326, he had to put on the guard. as they come out of the the box that way, with no guard. as far as the trimmer head t35x the blue tap( does not spin with the rest of the trimmer head) or spines independent from the trimmer head. can't remember. but you can look under the tap it pull right off. or just ask the dealer if he switched them or how to tell the differance?