I have wheels very similar to that on a roadster with the 10 spokes in a small Ford pattern made by E/T. They are about 5-10 years old so it is possible that they are also being made in 5 1/2. Good luck.
Those are made by Rocket Racing, called the "Rocket Launcher" but they only make 2 bolt patterns but no 5 x 5.5, Sorry, link to site http://www.rocketracingwheels.com/rocket-launcher-polished/p37 Its hard to find the wheels you really want, I just went thur this exact situation and got these in 5x5.5 also made by Rocket, YMMV
Now I just need to find out if that style wheel with the offered 2 inch back space will work with my Buick drums.
Another option is PS Vintage Wheels formerly PS Engineering. I had them make these fronts, also offered as a bolt-on wheel. Rears are 10 inch wide, requested back spacing made to the maximum. From their website. Custom backspacings in the two piece line are very open and standard http://psvintagewheels.com/products.html