Tempting to jump on the bandwagon here, but I'll recommend whatever Honda said worked.

It all depends on whether you have modified anything really - I ran without one at all when racing so the choice is anything from stock to nothing...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball