if it is the two oring/retainers that are found between the oil filter bracket and the block... you can get those from you local nissan dealer for like 6 bucks a piece. if it is the oil pump o-ring, you also can get that from the dealer. the two o-ring/retainers can be found on the 91-2001 sr20 fwd, or the 1998 ka24 fwd. the oil pump o-ring can be found on the 91-2001 sr20 fwd. or you can find them on srswap.com.