I'd love such, if they had both design features, functional vents and fin to direct airflow more optimal around side mirrors.
These GRMN looked favorite to all the aftermarket fins out there that i've seen for twins, looks wise and functionality wise .. their price though is a bit .. slightly .. on high side
.
(IIRC P/Ns
75041-18010 & 75042-18010 for $486 each, and possibly price w/o emblem & mesh, and that's before adding in importing fees).
With this design imho there will also be less issues with rain getting in. Most of that will be guarded off by fin when parked, and by pressure of air venting out, when driving.