We normally do this o-ring too and if the car is more than 15 years old do the injector o-rings

1 91212-PR7-A01 OIL SEAL (41X56X7)
6 91301-PM7-003 O-RING (7.3X2.2)
6 16472-PH7-003 SEAL RING, INJECTOR
6 16473-P10-A01 RUBBER RING, INJECTOR
1 16741-PG7-005 O-RING, PRESSURE REGULATOR (12.1X1.9) (HONDA KIKAKI)