Mystery part identification

Calling all anoraks and officianados of Works Triumphs. Can you identify a part for me?

In the boot of a world Cup car there are a number of modifications to the diff mounts, mainly to strengthen the area and enable quicker diff changes.

Here's a view of WRX's boot, ignore the floor, it isn't the correct floor, the right one is awaiting installation . What you're looking at is the two holes above the diff mounts. Ordinary production cars have this all boxed in.
Here's a close up below - what I'm trying to identify are the domes that are welded over the diff pins - they are substantial. But what are they from? Where did the parts come from?
Any ideas?? Get in touch by email, chinn at ntlworld.com

Thanks

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