Rao, I don't get your question. You mean the little chunk of metal? I can't tell what it is but it is
very small and seems like it could have been a piece of piston, although I don't know how it would've made it's way by the banjo bolt filter.
Is that what you mean?
There is a lot of confusion on all the different Torx varieties, even by the people who make them.
I used the S-K 84231 shown/mentioned in posts #12 and #16...