A breakdown:
A one-piece finned unit designed to rectify and regulate 3-Phase 12volt power. Replaces Lucas #83539 rectifier and #49589 diode. Very dependable. Comes with a 2-year warranty, and at less than half the cost of the original Lucas parts. Measures 3"x4"x1" thick.. Includes instructions. Negative ground only. Made in the U.S.A.
What you get:

Where you get it:
http://www.mapcycle.com/itemdesc.asp?ic=MAP4102&eq=&Tp=
Enjoy!

