I found the AZ-3 sills from an eBay seller.
Today I installed an RX-7 VAF, still have to get the multimeter out to tune it (according to:
http://www.nwerdt.com/how-to/mechanical/rx7vafswap.htm) but seems to work well thus far.
Picture with the black cover off (in order to tune it)

Picture of the outlet... Notice the small gap on the trap door on top. Do you guys think this will make it at all defective? It is installed but like I said cannot notice much difference due to tuning of it.

Installed. It has a larger diameter 3" outlet so I went to Home Depot and got a rubber adapter.
Tomorrow:
Installing Bronze UK vents (after I paint them)