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Fork Spring Kit - Heavy-Duty - 39 mm
Heavy-duty version of the Progressive Suspension fork springs, The cost-effective go-to for a substantial increase in front end ride quality, Includes Progressive Suspension rate springs combined with preload spacers, Improves front end stability and brake dive control as well as increases comfort for heavier riders or those looking for a firm high-performance feel out of their forks
| 2015-2020 | Harley-Davidson | XG750 Street 750 | - | - |
| 2015-2020 | Harley-Davidson | XG500 Street 500 | - | - |
| 2014-2017 | Harley-Davidson | XL1200T SuperLow 1200T | - | - |
| 2012-2015 | Harley-Davidson | XL1200V Seventy-Two | - | - |
| 2011-2015 | Harley-Davidson | XL883L SuperLow | - | - |
| 2011-2015 | Harley-Davidson | 1200 XLCP | - | - |
| 2010-2015 | Harley-Davidson | XL1200X Forty-Eight | - | - |
| 2009-2015 | Harley-Davidson | XL883N Iron 883 | - | - |
| 2009 | Harley-Davidson | 883 EFI XL | - | - |
| 2007-2012 | Harley-Davidson | XL1200N Sportster 1200 Nightster | - | - |
| 2007 | Harley-Davidson | XL50 50th Anniversary Sportster | - | - |
| 2007 | Harley-Davidson | 883 Roadster XLR | - | - |
| 2006-2011 | Harley-Davidson | XL1200L Sportster 1200 Low | - | - |
| 2006 | Harley-Davidson | 883 Low EFI XLL | - | - |
| 2006 | Harley-Davidson | 883 Roadster EFI XLR | - | - |
| 2006 | Harley-Davidson | 1200 Roadster EFI XLR | - | - |
| 2006 | Harley-Davidson | 1200 Low EFI XLL | - | - |
| 2005-2010 | Harley-Davidson | XL883L Sportster 883 Low | - | - |
| 2005-2007 | Harley-Davidson | XL883R Sportster 883 Roadster | - | - |
| 2004-2009 | Harley-Davidson | XL883C Sportster 883 Custom | - | - |
| 2004-2008 | Harley-Davidson | XL1200R Sportster 1200 Roadster | - | - |
| 2004-2008 | Harley-Davidson | XL883 Sportster | - | - |
| 2004-2006 | Harley-Davidson | 883 Custom EFI XLC | - | - |
| 2004-2005 | Harley-Davidson | FXDLI Dyna Low Rider | - | - |
| 2002-2006 | Harley-Davidson | 1200 Custom EFI XLC | - | - |
| 1999-2003 | Harley-Davidson | Sportster 1200 XLH | - | - |
| 1999 | Harley-Davidson | FXDX Dyna Super Glide Sport | - | - |
| 1996-2015 | Harley-Davidson | XL1200C Sportster 1200 Custom | - | - |
| 1995-2000 | Harley-Davidson | FXDS-Conv Dyna Convertible | - | - |
| 1994-1995 | Harley-Davidson | XLH883DLX Sportster 883 Deluxe | - | - |
| 1993-2005 | Harley-Davidson | FXDL Dyna Low Rider | - | - |
| 1993 | Harley-Davidson | Sport Glide FXRT | - | - |
| 1992 | Harley-Davidson | FXDB-D Dyna Glide Daytona | - | - |
| 1992 | Harley-Davidson | FXDC Super Glide Custom | - | - |
| 1991 | Harley-Davidson | FXDB-S Dyna Glide Sturgis | - | - |
| 1989-2003 | Harley-Davidson | Sportster 883 XLH | - | - |
| 1988-1998, 2002-2003 | Harley-Davidson | XLH883HUG Sportster 883 Hugger | - | - |
| 1988-1998 | Harley-Davidson | XLH1200 | - | - |
| 1988-1992 | Harley-Davidson | FXRT Sport Glide | - | - |
| 1988, 1999-2001 | Harley-Davidson | XLH883 |