MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Those will work great. Since you have to melt the knurls into the holes your best bet is the exact diameter or slightly larger. If you're unsure about melting them in you can use a soldering iron and just push them in easily. Enjoy!