If you are looking at the front of the bolt carrier, the extractor should go at the 11 o-clock position. It will only fit in there one way!
As for the rubber insert, I would probably buy one if yours is missing/non-existent. Back in 1993, I don't know if anyone used them, but by today's standards, they are necessary/expected.
While you are looking to make tyhe purchase, C4IGrant selld a extractor improvement kit that includes a new spring, rubber insert, and rubber O-Ring...I just got one, and they are really nice and required for a reliable AR by today's standards!
Better known as "The CAC"!
"One is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully."
By: Lt Col Jeff Cooper, U.S.M.C., RIP
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