Help! can't find rear shock plate!

Anybody know where I can find a rear shock plate for a 69 mach 1 (351w)?
I've tried most of the usual guys (must. plus, cj pony, american pony, etc.,etc.) but no luck. I guess no ones making them yet. If I have them fabricated, does anyone have any idea how much it would cost aprx? Just when I think I'm getting somewhere something else sidelines me. Sheesh. If I didn't love that damn car so much......
 
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