Excellent response, Carey. I might add that two defroster vents work well in a Spyder(rather than three in a Speedster), both in function and ease of installation. The wiper motor and linkage makes it tight under there. Carey's laser-cut aluminum defrost trim is a beautiful and functional way to do this. I'm sure Carey has a better way, but I used shop-vac pieces for under the dash and 1.5" defrost hose.
I have a few Beck parts on my car: the defrost vents, the steering wheel hub, the shift rod, and the really exclusive clamshell stay. I'm probably forgetting something.
Every part that Carey and the boys make is a finished and quality piece.
I also have a used Beck top, new windshield catches and clips for the top on the clamshell. The top is partially fitted: windshield catches and frame mounts by the seats are fitted. The top I purchased did not have a folding frame, it only had the two hoops. So I made a folding frame out of some flat steel and rivets for hinges. And finally ferrules for side curtains in the doors. I'm eventually going to install this top and make custom plexi side windows.