What's the difference DEI 504M/D/K Shock sensors
 

Can someone explain to me what the differences are between the 3 DEI shock sensors 504M, 504D, and 504K?

http://www.drdetailshop.com/SENSORS.htm

Which one should I buy for our factory alarm?

nobody knows...

From what i researched (dont count me liable) M is old and discontinued. D is the newer version and K is even newer with LED function.

I ordered the D and will see if it works just as the M

Hey did you ever get this working?