hi david
one of my jeeps came stock with 6v electrics. the previous owner changed it over to 12v. the changes were, 12 alternator, solenoid, coil, lightbulbs. he retained the stock 6v starter, which is still going strong after20+ years. i guess when you consider the limited ammount of time a starter is used it likely won't burn out too fast. then again, we're talking about a ford here, and due to the erratic engine anomilies, the starter may get much more use than say a fine general motor's product.....just joking
mike