LMC does, (sorry for being a smartass
)
Actually, on my last truck, LMC pic diagrammed my e-brake setup.
Older models were different than the 80's models. Older ones "split" just under the transmission and a cable ran down each side of the frame rail. Couple "pigtails" hooked into the frame and acted as a guide.
I'm assuming it's the "pigtails" your missing, as they aren't really attached to anything, just kinda hooked into holes and easy to lose.
I don't have another diagram, the LMC one worked for me.
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'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold
)
I'm kinda like duct tape- no real purpose, but handy to have around.