saw them listed as the same part one place and different somewhere else.

I have the parts numbers as;

XT - 25721 GA461 HH

XT6 - 25721 GA810 HH

 

I cant see any difference in them except for the numbers.

they are different.

different bore sizes.

XT is 13/16"

XT6 is 15/16"

i think those numbers are correct.

Yeah, I read that over at the "Other Board" after I posted here. Go figure Theres nothing that I could find in the FSParts book, they dont tell you why it has different numbers.