This first picture shows all four types of lamp indicators that we sell. The Long stem, usually used on the rear of the bike, is 4 3/4" long, measured from the end of the stem to the base of the indicator. The short stem is 3" long
The indicators shown, starting from the left:
99-1190E/S, Economy, Short Stem.
99-1190E, Economy, Long Stem.
99-1190 , Lucas, Long Stem.
99-1190E, Lucas, Short Stem.

This next picture shows the difference between the lenses used on the indicators. The left lens is the economy lens and is plain without any writing. The Lucas lens, pictured on the right, has writing on the lens with the Lucas logo.
This next picture shows the difference in the bullet plug used on the indicators. The left and smaller bullet is on the economy indicator. You will need to purchase the correct Lucas bullet (15-900269) to plug this lens into the stock harness. The Lucas bullet, pictured on the right, is the correct bullet to plug into a stock harness.
The next two pictures show the difference in the bodies used on the indicators. The top picture is the economy indicator body and is plain. The Lucas body, the bottom picture, has writing on the body along with the Lucas logo.