American Honda parts stock carries most engine oil and coolant gallery plugs (bolts and washers) separately, even though they might not be listed in the parts catalog. Following is a handy chart.

ITEM.......................................... P/N...............................HONDA CODE

Head sealing bolt, 28 mm......12208-P8C-A01...............8515678

Washer, 28 mm.....................12207-634-300.................1119924

Block sealing bolt, 16 mm......11106-PT0-300................4769659

Washer, 16 mm.....................12207-PC6-300................2508059

Block sealing bolt, 20 mm......15233-PK1-000...............2622371

Washer, 20 mm.....................94109-20000....................0251728

Head sealing screw................12208-PG6-300...............2661114