Getting older versions of the SDK?

Is there a way of getting older versions of the SDK in Eclipse?

I can download the older version but it I can't get it to show up in the "SDK Manager" list.

The XML file in the folder with the SDKs gets recreated from other data.

The back button for menu2 is missing for widgets in 3.1.8 and 3.1.9. There's an X instead, which doesn't work the same.

Another option would be to create a handler for the X and do OnBack() in it. But I'd have to know what the handler is.