Bergonzoni's are very well known buggies. the Blast, and especially the Uruguay were both top-notch buggies, still are IMO, and I run Mugen...lol. Get ahold of Maxy Velasco (Maxy Fuels)...he'll be able to get ya hooked up
And your right about his diffs, some of the best on the planet, not to mention the lifetime warranty
their website is
www.bergonzoni.it
I hope your browser has a translator