Need to identify a particular K-member and Pitman

I'm new to FABO and excited about the info I've already obtained.

I have 73 Duster440/727,originally a 340 manual, I've bought a new front suspension replacement kit (ball joints, poly bushings,etc.) and I cant figure out what K-member is in it, it is not original, It appears to have the sway bar tunnelling through it...I'ts massive. The reason I ask is the pitman arm is not for a 340 duster either, I thought the steering box and P.Arm came with the Kmember, and I'm having trouble getting the correct one. It bends down and then comes up through the steering link(nut is on the top). Sure appreciate any help. I have some pics at http://s246.photobucket.com/albums/gg82/440DUSTER/?albumview=slideshow

Thanks