If you don't get any bites here, you might try the " '67 - '72 Parts Board" on the website:
www.67-72chevytrucks.com
Failing that you can buy new ones from LMC Trucks.
www.lmctruck.com
Might be cheap at a junkyard, too.
Good Luck.


Every 25 years I like to rebuild that 292 just for GP