I'm surprised too.
That would be great if you can use the leaf pack or at least the second leaf out of your parts car.
I have a set of aftermarket leaf packs here. You're welcome to the 'em for parts. One side is pretty shot, the other not too bad. My bet is most of the wear was in the main leafs. I can measure the leaf thickness for you to make sure their the same as your 64's inner leafs.