DING DING DING SOUND THE ALARM!...

Here's some pics of the $125 SM sbc crank trigger...

shopmulecranktrigger1.jpg

7" wheel dia
2.050" rear face of the "L" shaped sensor mount to the center of the sensor hole
2.510" rear face of the arc'd bracket to the center of the sensor hole

shopmulecranktrigger2.jpg

Plenty of meat to drill new mounting holes if needed.
The arc'd bracket has the series of timing dots on the other side as well, so it can be flipped for either left or right side mounting.

Grant