Pro-Series Roller Rocker Arms. Premium rocker arms are forged from 4140 steel and CNC-machined for a perfect fit. Feature a roller tip for less drag and a solid bushing for extended life. Harley-Davidson Genuine Sportster Rocker Box Set 17556-86A 17555-90 17554-86A.
How can you go wrong with TP Engineering products? It only gets better when you can get a deal for them. I have used TP stuff in a couple different bikes now with zero failures. Awesome products!!!!