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I don't know anything about a vent that replaces the ash tray, but I do know you'll want more than just that one vent, if there is such a thing. You'll have better circulation if you have one on each side of the dash. You can benefit from a third in the middle to help, but imho, it's less important than the side ducts.
I was hoping not to have to fabricate something. I was looking for something I could just buy and install...
Looks like I will have to design and build something.
I too built a lower dash extension and installed my AC vents in it after I filled my ash tray and glove box. My AC controls (modified Miata unit) go in the center console. A smooth brushed SS panel goes over the flat part of the dash.
I was hoping not to have to fabricate something. I was looking for something I could just buy and install...
Looks like I will have to design and build something.
It's been a while since I stumbled across it, but I think I remember seeing that someone makes a fiberglass dash extension for the 53-56 F100's. Have you checked the normal catalogs? (MidFifty, BlueOval, Sacramento Early Ford, etc)