Its going to be hard to find such a large spur for a buggy. Once you start getting that big you have to start worrying about not only the number of teeth but also the pitch.
That is quite large. what about doing a Savage gear swap...would that work. I'm not sure about savage gears but that may be an idea. Ask around in the savage section and research a bit
it mite work, i haven't really tried any gear ratios yet i was just going by the storm mt's setup.. a 13pinion and 48 spur mite work. i found the 54 tooth at gs but it will not be available to march..:shrug: