Many moons ago whilst inThailand I tried the very same thing.

It works but not with the mc21 lowers, head lamps are much much better than the 21's will ever be.

Tyga back in the day did a TYGA eyes kit for the 21 which shares many parts so give them a shout to see if they have any old stock kicking about first.

Over all I prefered the look of the 150 fairing as it was smaller and more compact, try and see.
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Farting is funny