Will a 2004 wideglide seat fit a 1999 sportster?

A 2004 Wide Glide seat is not directly compatible with a 1999 Sportster due to differences in frame design and mounting points. The Wide Glide typically has a different seat mounting system and dimensions compared to the Sportster. However, with some modifications, it may be possible to fit the seat, but this would require custom work. It's best to consult with a motorcycle expert or check aftermarket options designed specifically for the 1999 Sportster for a proper fit.