Specifically Death Valley Jade Accessory. What are these used for? It's been years since I played last and I don't remember these.... Can't find them in resource or create menus.
You can find the dude near the bridge.. It's a guest and for the mission you need to deliver exact thing to the dude. For Death Valley you can find the dude here: Valley of Hell dude you can find the mostly same place near the bridge.