X2 Snobuilder
Woodystraction.com has an application guide. Enter year and model and they recommend studs, number, pattern. You also have to match the runners / skegs. Also, studs allow for faster stopping which improves safety. Tunnel protectors also a good idea if not already installed. Will need backers and nuts.
Camoplast also offers tracks with studs already installed. I forget the model names of the tracks but I think ice ripper or ice attack. Might be cheaper, easier.