Prism Supply PS-41 Tailight - BrushedPrism Supply PS 41 tail light (Brushed) Looking for a stylish, modern spin on a classic Harley tail light? Prism Supply might have what you need in the PS 41 tail light. Their take of the RH 55 Guide light originally found on Panheads and Ironheads keeps the look but brings it into the modern era with some neat updates. The aluminum housing is 3. 375" wide by 2. 5" tall and just 1" deep, making the PS 41 light 30% smaller than the original after which