I have an early 08 15" MBP (pre unibody, model A1260) currently on 10.5.8. I need to repair leopard, but I cannot find my original discs. How can I obtain another set, and what details should I look for? I think it came with an earlier version of Leopard, so would I need to find the same discs, or could I use 10.5.8 discs?