Out of curiosity, what kind of windings are "HD WINDINGS"? HIGHER ENDURANCE IS A RELATIVE TERM. The windings (more specifically stator wire and size) only contribute to half of the alternator's output.....the diodes are the other component that convert the generated AC voltage and current by the stator to DC voltage and current by the diode assembly, to charge the battery and operate the vehicle. The voltage regulator, albeit an internal or external device, simply controls the excitation voltage on the alternator's rotating field, which in turn, controls the alternator's output....its that simple.
As an alternator is a simple device, WHY NOT rebuild it yourself? Each component is individually replaceable and is relatively easy to access. IF, YOU CAN INSTALL A NEW CAMSHAFT OR REBUILDING A REAR END ASSEMBLY, which is 100x more complex than rebuilding an alternator, there is no EXCUSE for not doing it yourself.....just my opinion of course......
BOB RENTON