Garrett depth multipliers

Just found out that Garrett made a few different bloodhound depth multipliers for the older metal detectors . I own a cx3 and a master hunter 2 . I was under the impression that the bloodhounds were the same for both machines and the older metal box ADS 1,2,3 , master hunter 5 etc but they are not . I collect some of this older machines if they are in mint to new condition and I try to find the unique accessories that where made for them . The difference between the bloodhounds where that some of the metal box detectors where using the 5kh frequency while the cx uses a different frequency. Also the pin connections are different. Anyways, just thought I would share just in case someone can’t figure out why the bloodhound attachment doesn’t on their detector . HH