Frank's (
https://www.frankspontiacparts.com/u.../gtoparts2.htm) has a set for 68-72 hardtop available. They had a set for the convert, but they're sold. Still, you could ping them in case anything new comes in in the next few days or weeks. I've had great dealings with them. Prices have been fair (for today's market), packing has been good, and shipping fairly quick. No complaints.
HTH