[Johns327]

VA does sell corner vent mounts are for the curved dash, I know because I have them. Bought them in January this year, there a pain to find on the web site, download their catalog. But as with everything they sell, $$.
I removed the three knobs in the center of the dash and mounted that center vent and eliminated all that under dash vents. VA sells a general purpose 4 port vent adapter that I put in and connected the vents to.
It’s not tough, just a little unnerving cutting big holes on painted parts.