Fuel Pump Hanger (Sending Unit) Question

[87M-GTE]

Both hangers are out of 87's.
What is the small box on the hanger and why is it not on the other one?

The Hanger on the Right-hand side I removed from my car last winter, and it worked without the little box..

Thanks!
Sam

 

[toyotanos]

pics fail x.x

 

[OneJArpus]

Stop being lazy and upload the pictures to googles picture site or photobucket... Dont try linking them directly from your email inbox.