Okay so I have a c521 with two bad capacitors on the motherboard, so I went to eBay and looked at a motherboard that looked exactly like it with the exception of one extra PCI slot that I didn't see at first until after I bought it. The motherboard is for an e521. Will the board fit in the case okay, or is it bad? And if it doesn't fit, can I just replace the capacitors? the boards are literally exactly the same, like I said, just one extra PCI slot at the bottom