If your problem is "spongy" brakes, the pads probably will not make a difference. Given your reservoir leak problem I suspect that you have air, moisture, or both in your lines. The reservoir itself should be the correct one, but maybe someone replaced the cap incorrectly, or damaged the seal. I suggest finding the real cause of the leak and fixing it, then replacing the fluid and thoroughly bleeding the lines. Only then would I look at new pads.
Sky NA 2007 Midnight Blue
Sky RL 2008 Carbon Flash - Naked