This a replacement distributor shaft seal, and o-ring for most Honda distributors. The seal is Kok #7830, which is direct replacement for Nok #BH3888-E. The seal dimensions are: 12.5mm X 22.5mm X 5mm. The distributor o-ring is #30110-PA1-732, which is a 26.4mm X 3.1mm oring.
THIS SEAL WILL NOT FIT THE F22B1 ENGINE, WITH DISTRIBUTOR NUMBER D4T92-04!
THIS SEAL WILL NOT FIT THE F23A1, F23A4, OR F23A7 ENGINES WITH THE HITACHI DISTRIBUTOR #D4T97-03!
THIS SEAL WILL NOT FIT HITACHI DISTRIBUTOR #D4T94-04!
I have the correct seal for those engines on another listing.
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