I ordered something from obsolete chevy, that fit a late 60's-70's truck for my 62 k-20. Definitley not the same as the original, but got them to work. Also search parking brake lever in autopartswarehouse.com. Stuff comes up that you may be able to make work. In the meantime, keep looking. I was fortunate enough to get a set from someone who noticed a post on another board.
