They must sell it, I had my buddy do my brakes on two cars within the past year and all the hardware matched original. I am sure I have the original springs if you want those.
I've been looking raybestos shows the same part number for 67-68 front and back. H2532 and H2533
The actuating link shows the same in every kit I've seen. If you have yours, I take them unless someone knows another resource to get them.
