If I am reading that package correctly does it not say that is is for the T-Maxx 7.5 gears?? If so then I do believe that you either received the wrong bulks, or you ordered the wrong number.
hhmm , i just compared it to the stock diff case , the hybrid seems to have a bigger bearing space , bigger openings and bigger internal space , i think the gear m8 be big , gonna check some other diffs in the hobby shop