Custom reluctor ring, suggestions on where to get one

I can get one done. I sell these 36-1 wheels here: [FOR SALE] - 36-1 Crank Trigger Wheels 318/340/360/383/440

I believe the factory Magnum reluctor had 8 holes, but I'm not sure of the overall diameter of the ring? Size of the holes and overall diameter would come in to play when designing a smaller one to be pressed on to the crank pulley.