I've never seen one for sale.
I can tell you this. I had mine apart this month because I rewired my tailights to blink with the signals.
I tried to get the lens seperated from the tail light housing and it wasn't gonna happen very easily. I broke a tab and decided I had no business taking it apart anyway since I was just being curious.
SOme people have bought tinting spray and amek their tailights tinted.. and they looked pretty good.