Some thoughts FWIW (again I claim NO/not much expertise in things electrical)...
I bought my new VR directly from B&C just before (naturally) Van's came out with their complete retrofit kit. B&C provided documentation for several generic mounting/connecting options, but I bought the remaining items from Vans to accomplish their retrofit including the NACA duct figuring they must have designed it that way for a reason, probably to maximize cooling air for my new $$ VR. And I'm sure Vans is getting weary of hearing about problems with the VRs, plus the original (meaning very first) VR location and cooling design alway struck me as "kludgy".
So anyway...I understand the "plug and play" aspect and was tempted to just swap my B&C into my "under-shelf" location, then decided to go with the new kit because we can never have too much cooling air for hot electrical stuff