Easier said than done, I've been after one for years..but either rooted outlanes, missing black glass replaced with translite or a combination of both. Six have been sold publically since 07' and one original backglass by itself.  I know of a really nice one that's in WA. There is one going to be on the market shortly but typical DE wear on the outlanes yet again. Over in the states its hard to find a bad one, over here it seems we get the roughies when they do surface once a blue moon.