Left and right hand electrode pair 33085 and 33086. These electrodes are used on Clean Burn burner models ending in HS such as CB 90 HS, CB 85 HS and are also used on the CB 90 HPB-Air. Those burners are found on CB 90 AA, CB 90 AH, CB 90 BH, CB 90 C, CB 90 D, CB 86 AH, CB 86 BH and CB 85 C. Some furnaces may have different burners than what originally come with them. So it's best to verify by looking at your burner plate.