There's only two places that I know of you can get aluminum sliders-
Sampson Sport Touring - They're not shown on the website, but if you send an email to the 'contact' info, you should hear back. I know that Ron makes them, I have the beta set on my bike.
And then there's here: The other place These are really pretty.
Other than these two, I don't know of anyone else that makes aluminum sliders.
I wanted polished aluminum and decided to check ebay...just purchased a set of polished from supplyndemand for $18.00...I will post a pic and let everyone know the quality of them when I get them.
They are sturdy, well made and the Yamaha mechanics said they were amongst the nicest they have come across. Maybe they were just being polite, though <_<
Wow...those are NICE and different...I find myself always wanting to go with something that is different...to bad I didn't see those yesterday...ah heck I have to have them so I will order them also ...cool