I've had a few vintage YBA-1's. The last one, a 1967. I replaced the old, rusty corners with new ones from one of those electronics parts places in Arizona (can't remember the name). The replacement corners were not a perfect fit. The screw holes were aligned OK, but the radius of the corners left a gap with the contours of the case. It wasn't a big concern as it was only noticeable upon close inspection.
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