Wisco most of the aftermarket air covers that are designed for the x wedge or most of the other v twins won't fit the x wedge on the 3 wheelers.
I've spent some time looking at this and the problem is the mounting plate which holds the intake assembly is different. In order to maximise you're choice of options it'll be necessary to get an adaptor made. I've tried and was hoping for some feedback from a supplier but he needs a 3 wheeler for a day, and is based near Blackpool is anyone is up for it.