Boss Frog harness bar up for sale on ebay. Currently sitting at $40 without a bid. Item 180239452202
The bar is 38 1/4" bracket to bracket. Overall about 46". About 44 1/2" bolt center to bolt center on the outside mounting holes. But I'm not sure that the Miata bar is likely to fit a Scion - here's the Boss Frog webpage so you can get an idea:
Advertise on SCCAForums.com and reach thousands of visitors per day!
SafeRacer FREE SHIPPING over $99
Shop for Pirelli tires at Tire Rack.