Like 2Yoopers, we went with vents from dwincorp. We ordered the Jetstream 8850's as they fit in the same hole as the old ones on our 3150. No hacking away at vent louvers and
they flow way more that the OEM ones. They swivel 360 and open about 45 degrees.
https://www.dwincorp.com/product-cat...ting-products/