Door Window Track - Any Year

[CudaA39]

So lucky me, I disassemble my doors and find the driver side is original 71 and the passenger side appears to be 73-74, which means Ill need to buy two separate rebuild kits since they only seem to sell the kits as a whole and not individually.   
Based on what I can see, the only difference appears to be the main arced support guide in the front...the 71 being wider and the 73-74 being slim.  So I'm looking for one of either year so I can convert the other and simplify things.

[anlauto]

There's a left and right, so you'll need to be more specific 

[CudaA39]

This is the specific piece I'm talking about.  It appears to be universal so maybe I didn't describe it correctly unless it's subtle.

[anlauto]

If you look closer at the wide one, around the top, you should find an "R" or "L"   I don't know too much about the narrow ones

[Challenger in NC]

I have these two tracks, not sure if this will help you out, both say R. I believe these are the wide versions.

[CudaA39]

Pm sent.  I don't see any identifying marks on mine except maybe a part number...nothing L or R and I don't see any features that don't appear symmetrical.

[anlauto]

I sorta pride myself on E Body door glass, having restored almost 40 E Bodies now, it's still one of my favorite jobs to do....

I can't speak much about the newer, narrow channel, but all the 70-71's I've worked on have been marked, some clearer than others....I just took this picture of the AAR I'm currently doing...