I need an aluminum corner protector , about 3/2 " wide on each side and about 9 feet long Can you provide such an item?

Yes, look near the plumbing and electrical... there is a section with corner beads.

Sure!!

You might want to call your nearest HD location. they will be able to help as the community wouldn't know that

For dry wall... sure HD has them

Apologies but I'm the wrong person to ask as I'm not sure. But pretty sure home depot can help.