steering parts help needed

[flomulgator]

Hi folks,
I got an axle set that is a GM 9.5" gov lock 4.10 R&P. The guy I bought it off of said it was from a 1984 chevy pickup, I presume a K20. I've been running the gear for a couple years now but the steering is getting pretty sloppy and it's time to replace all the steering bushings and joints.

Problem is, I can't make sense of the parts. LMC Truck has two different possible applications for the tie rods for that truck, as noted here:
http://www.lmctruck.com/icatalog/cc/full.aspx?Page=149
in the lower right corner ("C" or "D"). My existing setup is the "D" setup, but it is upside down of the orientation shown in the picture (tie rod joints point up on my truck).
However, I do have a 4.10 rear end. I don't know my drum brakes, but went out and measured them and outside rim (inboard of towards axle) to outside rim is just a bit under 15". inner rim to inner rim appeared to be around 14".

Am I the "D" application or did a previous owner swap parts around?

Thanks for any help!