Found these at gbodyparts.com. They have a kit for 78-87 G-bodies but they also fit 73-77 and 68-72. I know they were used on 72's but not sure on older models. I've not seen these offered anywhere else. https://gbodyparts.com/1978-1988-gb....html?osCsid=f94f8c7b3fa5e43eb72ca066bb9ebd0d