Upper box cover gasket 

Ref. H-D : 34917-99B

As per photos

Brand : Harley-Davidson

Type : New

Fits on :

The part is compatible with the following motorcycles:

Dyna

• Super Glide
  Standard : FXD (1999-2005), FXDI (2004-2005).
  Convertible : FXDS CONV (1999-2000).
  Sport : FXDX (1999-2005), FXDXI (2004-2005).
  T-Sport : FXDXT (2001-2003).

• Super Glide Custom
  Standard : FXDC (2005), FXDCI (2005).

• Low Rider
  Standard : FXDL (1999-2005), FXDLI (2004-2005).

• Defender
  FXDP (2001-2004).

• Wide Glide
  Standard : FXDWG (1999-2005), FXDWGI (2004-2005).
  CVO : FXDWG2 (2001), FXDWG3 (2002).