The spiral in lower grey is almost certainly the top of a barbed wire fence, so it would have to be rotates so its horizontal
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This is how I got 1029-LY and 7676-AL to fit together
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I think you're right about those fitting together, lookin at the barbed wire spiral
if you rotated it counter clockwise and pushed it over so theres a gap where his head should be, i think thats the final picture