Genuine Weber part #68950 Spirit 315 LP Burner Tube Kit. Includes (3) main burners, crossover tube 69413, instructions. Left and right burners are 18"; center burner is 17-3/4", Crossover is 15-1/4". This set is replacing part 69787 which fit LP and NG grills. The 68950 set has been modified to specifically burn LP more efficiently for better grill performance.