I just did the same thing...
I went ahead and got pretty much all new hardware for mine. My 5 gallon setup used a 1/2 setup if memory serves. The 10 gallon used a 5/8.
I went with the 10 gallon rubbermaid setup from my local hardware store. This time of year I snagged one for $40! Typically I see them around 65+
My main worry now (and something ill play with this weekend) is that I use the mesh tube method. I dont have a false bottom. I need to find a way to reinforce the tube so the weight of the extra grain doesnt crush my tube.
From what I have read the 10 gallons use a 12" false bottom. Not sure if that helps you any, and I would triple check this lol. Im slammed here at work and just trying to log on for a second