Yard Sale

Look into the explorer 8.8 sticky thread. I found a company that will custom make the rear parking brake cables as hybrid cables to fit your 69 valiant body and the explorer parking brake. I worked with them to make the prototype cables. It's near the back end of the 8.8 thread www.bruinbrakecables.com.

I think somebody else on the thread stated the inner cable part needed to be a couple inches shorter, but you still can get adjustment on them.
I only mocked up the rear cables as fitment on a chassis I was scrapping.