XL Sportster Intake Valve Seat, 883  (OEM/NOS #18021-87)

Correct valve seat for 883 models beginning in 1987, and the part number appears to at least 1998, possibly longer.    By 2002, the Factory uses the same part number with the "A" designator.  

• Condition: New  (OEM/NOS)
  
• Type: XL
  
• Vintage:  1987-98 (likely later, was well)