[jhautz]

The HB ring gear fits the Cen dif cup with a little minor dremel work for fittng. I know I had a set on the CEN cups in a matrix buggy for a while. In the truggy I just swapped the entire diff to the HB diff. Either way will work I think.

See if you can pick up a used set of the HB diffs on ebay or something. You should be able to find something for that money.