Old parking brake parts aren't always available for D60s and HOs (or at least I haven't found them easily yet) - I had a hard time locating parts for my 71 C20 with a D60. inline tube was helpful in building new parking brake cables from cores, but sounds like you have that suitcased already. I'd recommend going to the parts forum
http://67-72chevytrucks.com/vboard/f...ysprune=30&f=8 and posting a want-to-buy ad - you can reference these pictures - maybe stick some arrows or circles on them to show what you need and someone that is parting a whole truck can probably help you. I'd post the WTB ad and also scour all the 3/4 tons being parted - and I bet you'll have the parts you need pretty quickly. Below is a redone 71 Dana 60 rear brake setup for ref (passenger side) - if you follow the parking brake cable coming in from the right to the left from behind the backing plate in picture 2, you can trace along to what the end of the park brake cable slips into. It's the innermost lever arm that fits behind the rear shoe and, in pic 1, attaches to the spreader bar. Hope this helps.