Ok So I made this adapter for a 3rd party Mastershooter Collectables figure. However this will work with siege targetmasters. It is a small adapter that plugs into the back of the car mode for power of the primes Rodimus Prime. The hole is 5mm compatible so you can store it in varius places on the figure when not in use. It turns his car mode into a targetmaster compatible car.
I should note this test model was printed in white on a home printer. Shapeways may vary in tolerence.