Quick question:

Are the saddles on the lo-pro Edge trem all the same size? I know they are elevated differently, I'm talking about the size of the individual saddles.

Edit: Taken off the saddles now and see that there are 4 saddles stamped "2" and 2 saddles stamped "3" on the underside. Do the saddles stamped with "3" go in the middle positions?

They're all the same size - I have a feeling that those ID numbers are somehow something to do with the manufacturing process (perhaps to track the tooling that produced it, in case of problems in mfg). This is unlike saddled like a (genuine) Floyd Rose, which are made in 3 different heights to create basic radii.
So positions are completely interchangeable on these, as the stepped base plate creates the radius.

Hope this helps.