In search of more, rare Michael Jordan-era memorabilia? Horace Grant's got ya covered -- 'cause TMZ Sports has learned MJ's former Chicago teammate's three title rings he won with His Airness in the early 1990s are up for auction.
The rare items come from the Bulls' first 3-peat in 1991, 1992 and 1993 -- when HG played a key role alongside Jordan and Scottie Pippen.
The rings feature the former power forward's last name ... with the Bulls' season record on one side and the World Champion title year/postseason record on the other.