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.
What is the cross reference of BPR5ES to Champion Champion RN11YC
CJ7Y works with no issues.
ngk BPMR4A
Champion RZ7C
8902 cross reference plug
YES
Brp6hs
BCPR7ES
The Champion part number is {| |- | QCJ8Y |}
cross reference ngk BP4HS
The equivalent NGK plug would be B2LM
there are no listings for that conversion