No start on ‘91 coupe quattro again

[Christopher Gharibo]

My coupe quattro truly tests my patience at times. 

It didn’t start this morning despite cranking very well. I pulled the codes and it revealed G4 00514 ignition point sensor. 

This appears to be a reference sender. Of course, it is NLA. Besides a used one, do I have any other options?

The hall sensor, reference and speed sensors all look the same. Are they also interchangeable?

CG