The airbox for the RV14 fits ok. It’s going to need surgery but It’s manageable. I had to slice the four corners of the airbox to get it to fit into the filter holder.
Looks ok here. I modified this a bit later because the box was pushing up the baffle. I simply removed the clecos and slid the box further up into the filter holder.
You can’t see it from here but the face of the airbox is flush against the intake on the right side but is about 1/4″ away from the left side of the intake.