Clueless in Nashville - Front End Questions

[ChumBucket]

Before any of you say anything, yes I'm sure the answer to all of my questions lie somewhere in the FAQ or build thread, but at the point I'm at more information is only going to confuse me even more.

Here's my questions:
1. Are all LCA's and UCA's the same on all 67-72 1/2 tons?
2. In regards to question #1 above, does that mean that balljoints from any of those years work? In other words, will 67 BJ's work in the UCA's/LCA's as well as 72 BJ's?

Here's why I'm confused...I'm trying to determine which drop spindles to order 67-69 or 70-72 (or however they're broken up). No, it's not as easy as just buying the spindles for the year of my truck. My truck is a '69 BUT the PO "MAYBE" put a 71 frond end with 5 lug disc brakes/spindles on it.

SO, here's what I think I'm gonna do...(until y'all tell me otherwise)
1. Buy drop spndles for a 71
2. Buy new upper and lower BJ's to fit 71 spindles

Is this a "DUH" question?

Sorry guys, thanks in advance for your help, this frame off thing has got me to where I can't even think straight anymore.