Hi Bill,
You'll have no problem. I have a 17" Slim and a 19" Fats. The light bar is well below the bottom of windscreen. If you use oversize lamps it may be a problem. The front blinkers reflect bad off the Fats at night. When I get my lightbar (or when I find one at a reasonable price), I plan to relocate my turn signals.

Ride Safe, Dennis Triumph, it's how I live and what I ride.