TKA1000 New Timing Chain Kit Meets or Exceeds OE Standard Quality and Performance Requirements. Fits : 99-05 GM 3.1L 3.4L 3.5L 3.9L V6 189 207 213 237 Includes : 1 Timing Chain (80 link - 2nd design) 1 Guide Rail (damper) 1 Cam Sprocket (50 teeth) 1 Crank Sprocket (25 teeth) Fits 2nd design engine with 80 link timing chain. Confirm this part fits your vehicle before purchasing by checking fitment data above.