FS rear arms

[tsan]

The last time i ran my ZX5 FS, I broke one of my rear suspension arms. (never broke one before, in almost 2 years of running zx5's or rb5's!)

Anyway, I've got a question. The arms on my car have 3 holes on either side of the arm, but when check the exploded view for a reference/part number, I see there is only 2 holes. I have some arms that are similar to those, (not 100% sure if they are for fs/sp) but the width is a couple of mm narrower than the one already on my car. Any one know if the arms are supposed to be the 3 hole versions I have on my car, or the 2 hole version in the exploded view? And, does anyone know the part number for the 3 hole type?
Sorry for rambling on!

First pic is the longer, 3 hole arm. Third pic is the shorter, 2 hole version.
(Ignore the shoe goo holding in the pin... I need to replace the screw, too.:P)