You don’t have access to the sunglasses/xmetal exchange yet due to time and number of posts. Stick around for 2 weeks and chum it up in the forums about your Oakley love for 15 posts and you’ll then have access.
Or, you can grab a premium membership and have instant access.
You’ll find plenty of a Juliet options at better prices than eBay!....and probably more that you fancy. Pretty much any lens options are available with the expertise of @Chris A Hardaway cutting OEM lenses for frames.