Both styles of turn signals came on these trucks so the only way to tell would be to know that none of the early trucks were of the solid state, non Sparton type and approx. what vin the solid state started at...when the solid state started, there are still trucks mixed in with the Sparton setup...basically, if they ran out of a component to install the solid state, the went back to the Sparton setup until they had the solid state parts again...
Jeep did it cheap...
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!