O-ring to seal the bottom bolt on the oil filter cover to the crankcase
Part number: 9321007135
Price: $0.50

Photo courtesy of Gregory Bender.
O-ring to seal the bottom bolt on the oil filter cover to the crankcase
Quick reference code: OR-1
O-ring to seal the bottom bolt on the oil filter cover to the crankcase (YPN# 93210-07135). Fits 1992 - 2007 model years. One is required. Sold each.

Photo courtesy of Gregory Bender.