Visually Differentiate r180 from r160?

Trying to figure out how can i Visually Differentiate a r180 from a r160? From what i know STI diffs are bulkier, and have a decent size letter "K" or is it a "M" stamped on top of it.

This one seems to be a r160, but no sure.

 

Well, there's no temp sensor on the back, so I would say r160.

 

Oh, and I think its supposed to be a "K". You could measure the vertical dimensions of both as the r180 should be taller, iirc.

 

i don't have a r160 laying around that i can messure. Can you post a pic of r180 showing the rear temp sensor.

 

i got it, i see what u meant by rear temp sensor. Thanks for the help.
acutally got it:

 

Here's another pic for reference. R180 on the left and R160 in the middle.