I have a 69 Firebird and I am replacing the trunk floor pan. I am not having any luck finding the braces that go from the trunk pan (extension) to the rear quarters. This brace is also the support for the bumper mount area I thinking. Anyway the only ones I have found are the smaller single hole one that I think are for the 67-68 years. The ones on mine have 2 holes and are wider. Anyone know where I might find these?