Looking for a piece of plain Koa for soprano top

Checking to see if anyone has an orphan piece of koa for a replacement top for an old Hawaiian style soprano. If I hope to somewhat match the back and sides it would need to be very light colored with little to no striping and only the slightest touch of curl, if any. A single piece would be best so at least 6.5" wide by 9.5" tall. Happy to trade or pay for it. Would be nice to bring this very old soprano back to life!

All the koa I have is quite stripey or very curly and I don't think it would look right. Anyhow, if you have an orphan in your wood stash, let me know. Mahalo!