Here's some info I found:
If the wings are squared off at the ends, it is an 807 series.
If the edges are rounded where it meets the cab near the drip rail, it is an 800 series.
1000 series, the only visor that has a stainless/chrome trim along the leading edge of the wings.
That came from here which has full instructions. Good luck.
http://53truck.ez15loan.com/howto/fulton-spec.htm Curt B.
