I thought I would make a separate Topic for this.
Had previously posted in what was really an unrelated Topic.
It's a heads up for OSXWifi - no I'm not related or benefiting!
Previously I had used & was happy with the MacVidcards mod, a few years ago, & have now modded another Mac Pro 5,1.
I had problems with the MacVidcards mod - the card has been changed from what you see on the site - whereby the antenna terminals are on the underside of the card, which makes a difficult job nearly impossible. Additionally the cable to the bluetooth fitting was faulty, I've sent several emails with no resolution.
In the end I bought the OSXWifi card, which is similar to my original Macvidcards upgrade card. The antenna cable connectors are on the top which makes life a hell of a lot easier. Additionally the connector to the original bluetooth point is much better.
Additionally they have solutions for more Mac types.