Hipshot for Schecter?

I have the carbon black and grey Schecter Michael Anthony bass. I wanna get a hipshot bass extender so I can drop the E to D quickly.

There are a few options I see, does anyone know the right one I need to get?
 
This will not be the last time that having a caliper in the kitchen junk drawer would be a good thing.

dial calipers are a bit less of a learned skill & chore to use and digitals even less, but both are kinda fragile for a casual user to take care of.