915 shift tower: is this a 4 or 5 spd??
 

From a Pelican I bought a 915 5 spd (73) and I need a shift tower for it. I have been offered the one shown but how can I see it's for a 4 or 5 spd? I am aware that in a 4spd something is blocked to prevent shifting into 5th but how is it blocked?

Thanks in advance.

Richard
http://forums.pelicanparts.com/uploa...1193749144.jpg
http://forums.pelicanparts.com/uploa...1193749175.jpg