It is there, (the diamond stab) enlarge the pic and look closely at the paint trim lines. You will see a distinct "kink" in the line at approximately 1/3 back along the chord from the LE. Also note that there is about 1/2" to 3/4" missing from the TE of the rudder. It should extend back further. Look at my drawing on post #11. The missing material makes it look funny.

-Robert