You'll have better luck with finding a 70 to 73 panel versus the 67 to 69. I have a 68 and finding the rear quarter extensions has been hard. I don't think i would swap to a 70 tail panel.
MrG
Those are the rear quarter extensions and they run about 175 to 200 bucks plus shipping. I am also looking for these pieces. They are out there. Start with ebay.
MrG