These are the fanandspeakerthingies of an A500 on the left and an OEM full tower very close to the Q500. I remember the one in the Q500 being yet another type.
I'm pretty sure it's the standard A500 but I bought that one used, without the box.
So, not standardized at all, I'm afraid. Their mounting spots might well be similar, but the depth corresponds with that of the case and ISA standard, so not trivial.
Little hook on the left corresponds with the motherboard tray.
If you can find someone to digitize his, that might make for a nice job for a 3D printer? I know next to nothing of them. They print. In 3D. Apparently.
If there's a pro for these things in Berlin, I'll be happy to bring mine to them.
Good hunting!