Quoted from Frax:So with these extended ones, there's no way to attach them then without putting extra holes in the cabinet since they don't ship with them....
I have a Xmen Wolverine right beside our new Tron Pro and the Wolverine has the same rails as the ones you've ordered for your Tron (just blue on Xmen). You'll be able to put them on no problem as the 4 main mounting screws on the side of the cabinet are the same (so you'll just unscrew the 4 screws on the existing side rail, pop off, install the new one and put the 4 screws back in). You might be able to get away with not having to install the additional 3 screws around the flipper button, I unscrewed the 3 from one side of our Xmen and it still sits flush against the side of the cabinet. Didn't try to play a game with the screws out, maybe it would end up rattling, not sure.
So don't worry if you don't have those 3 small additional screws (so 6 in total) when you get your new siderails, you'll still be able to install them and then at a future date you can add the additional screws.