Hey,
Yep we still have some albeit limited numbers on certain colors/sizes, though you can spray paint the magenta ones. You can find them here:
https://xlab-usa.com/...66-aero-spacers.html The use of the spacers is very individualized. It depends on that person's setups and what they want to accomplish.
Same answer with the aero benefits. You can have wind come from all directions - though most tests are run at 10 degrees from the front.Then there are different hand positions, whether both hands are on their respective extensions, or one is cupping their hands at the very front. As a general statement, if you are angled up at 15 degrees than yes it could have an affect on the aero benefits, though there are other factors that can come into play.
Candice Turner
CEO
XLAB - Aerodynamic Triathlon Accessories
Dawn to Dusk - Off-road Specific Storage Accessories
http://www.XLAB-USA.com http://www.dawntodusk.bike