Duster Mirror cable length

Becoming embarrassed about how much posting I've been doing....
'70 Duster. I'm saying that with what I have there is NO WAY that my left remote, round mirror is going to play nicely with the window. I find no way to position the cables out of the way enough so that the window doesn't hit them on the way up.
Having my mirror rechromed meant having to remove the cable assembly. I remember using at least one other mirror for parts and for trial and error with crimping the cable stuff back together. The only thing that makes sense to me is that maybe whatever donor mirror I ended-up with had shorter cables than the original.
Also there's a cable guide/bracket that goes in-there somewhere but I also can't find any sensible place to mount it. My disassembly notes from 7 years ago say "this bracket fell-out when removing a bolr so I don't know exactly where it goes". Great. At least my record keeping is accurate.
The mirror I'm getting nowhere with has a cable that is about 15" long.
Thanks in-advance for any ideas.