Heater control knobs and levers

[MarcMyWord]

I KNOW I'm not the only one who's had this problem. While attempting to pull the plastic knobs off the heater controls, I ended up breaking two of the metal levers. So now I have this sharp nubs for two of the controls (which is a shame since I fixed everything else -- never knew I had a three-speed fan!)

Anyway, my local Chevy dealer can't even find a parts book, so he can't look up availability of these levers. Can anyone provide me with a part number for the individual levers? Or are there inexpensive aftermarket replacements? As a last resort, I'll hit the local junkyard. Truck is a 1970 and doesn't have a/c.

Thanks,

Marc