For your consideration listed on Ebay. Vintage Lakewood Competition J-bolt Traction Bars for 67 to 69 Camaro and Firebird also 68 to 72 Nova. Auction has a low starting price and NO RESERVE. If you are interested, here is a link to the auction;
https://m.ebay.com/itm/Vintage-Lakew...YAAOSwuShadN0O