
....sorry....I thought you may know where the parts forum is...if you're married, tell her it's my fault that I posted this....and beware....you'll spend HOURS in here looking for parts!!!!
http://67-72chevytrucks.com/vboard/forumdisplay.php?f=8
Also, here's a diagram I like to post up for e-brake stuff...it's pretty helpful
As ChevloRay mentioned, the difference between 67/68 and 69-72 is that the 67-68 has a hand pulled ebrake, while the 69-72 has a foot operated ebrake...so the line exiting the firewall will be different locations....but after that it's pretty much the same for 67-72 (the areas highlighted in red)