NGK BPM8Y has no direct cross reference to Champion. That's because NGK uses finer-increment heat ratings than Champion. Use Champion CJ6Y, it's the closest heat rating match you will find. Thread, hex, depth, etc. are identical.
CJ7Y works with no issues.
What is the cross reference of BPR5ES to Champion Champion RN11YC
ngk BPMR4A
Champion RZ7C
8902 cross reference plug
BCPR7ES
Brp6hs
YES
cross reference ngk BP4HS
The equivalent NGK plug would be B2LM
The Champion part number is {| |- | QCJ8Y |}
Cj8y