There are two sets of towers "Regular" and "Short", both are made for UE shocks, but for different bulks or arms.

You would use Regular on any maxx with maxx style arms.
You would use Short on the tall Proline Dom Hybrid bulks.
You would use Short with G-maxx arms.
I wanted a matching front tower without wing mount holes for looks and weight :) As long as they sell it won't matter that there are 4 parts instead of two :W:
UE springs do not fit big bores, but lundsford do.