Sweet parts, Paul!
IMHO, the Boss Frog arms LOOK the least effective of all the fender braces I have seen. I had the Garage Star fender braces on Warbird but the Paco Motorsports have to be even better, again based on the design.
In my opinion the fender braces are one of the best braces to add to a NA/NB as they affect cowl shake, reduce NVH and improve turn in response. I definitely plan on trying the Paco Motorsports fender braces this time around.
I think braces are probably one of the most over looked aspect among the average miata enthusiast, sure frame rails are commonly recommended but that isn't even touching the true potential results that can be achieved./rant
P.S.-Stitch welding probably would make many of the braces unnecessary, again imo.