While 1157 is correct for the front turn signals, you might have the heavier duty bulbs instead.
I have an '07 Super Glide and both original bulbs burned out in a heavy rain (smoky blue-grey color). The bulb number was T198 and per NAPA, they are the trucker version of the 1157. They are designed to deal better with vibration and when I showed the clerk the bulb he asked, jokingly I think, if I was driving a semi or a motorcycle.