PBI Front Steel Sprocket 21T 530 for Harley-Davidson XLS XLH XLCH XLX 1979-1984.  PBI part number DS-191075.

Fits Harley-Davidson Roadster XLS years Late 1979-1984, Sportster 1000 XLH years Late 1979-1984, Sportster XLCH year Late 1979, and XLX 61 years 1983-Early 1984.