Mine are junk too. It's crazy they are readily available for four door cars but not two. I read somewhere on the Chevelle forum that a guy was making them out of billet and selling them on eBay, but the post was really old and I was unable to find them anywhere. Try Desert Valley but I'm not sure how well those will hold up in the sun and heat and also watch eBay. Good luck.
1968 Impala SS