I'm pretty sure that they have the 1200 sporty, not sure about the 883.
Try their website:
Eagle Rider Las Vegas
For riding gear I took down leather jackets and gloves, the rental place supplies helmets (open face 1/2 helmets). As with the last time I had full intentions of having the windshield put on the bike, but at the last minute the romantic notion of riding through the desert on a harley with the wind in my face won out--not so fun on a 600km ride. After the first hour my Oakleys weren't cutting it and my eyes had been watering for the full hour. I switched to the clear "goggle" type biker sunglasses I had bought at the rental place for $15. They totally kept the wind out of my eyes, but of course were clear as I had bought them incase we ended up riding back in the dark--so I ended up squinting a bit till my eyes accustomized themselves to the bright day. Bring good goggles with interchangeable lenses-- or a full face (which might be a bit iffy packing your $500 helmet on a plane). The other downside to a full face is the heat.
Take lots of water, as it is extremely dry in Death Valley.
Have fun