Custom reluctor ring, suggestions on where to get one

How does this work? "Around the circle" slot to slot I measured 4 33/64---34/64 or 5.515. That times 8? is is 36.12 which is not too far off of measured dia x pi (33.128)

If we use 4 34/64 that is 4.531, x8 is 36.248. I guess if you can accurately plot 8 positions on a layout by degrees, then all you need is the slot length