Pinion Yoke

According to the guy I talked to from JTR it needs to be metal since it has to react to a magnet in the pickup to make the pulse. He said their wheel was 3/16" steel. I have access to a machine shop that can make the wheel but don't know what the bolt spacing is for the 7290 yoke. They gave me 1-3/4" X 3-1/4" center to center on the holes in their wheel and its for a GM differential. I wold almost guess that its not the same as a MOPAR 7290 yoke. Why would I be that lucky.....

Larry