Keystation Pro 88 Replacement Parts

So I purchased a used Keystation Pro 88 from Guitar Center a couple months ago. They informed me that some of the C keys felt kind of spongy and weren't returning completely to their resting position. After a little googleing I figured I would buy it as it seemed to be a fairly simple fix.

Fast forward to a few weeks ago, I have it taken apart, and find out that some of the little tabs on the inside of the keys that go into the weighted part are busted, making them not work 100% right.

I'm just wondering if anyone knows of a place I can buy new keys and a few springs, as I have lost a few taking it apart. :(

Thanks