The Linear HAE00049 replaces the previous part number HAE00025. The Linear sprocket holder replacement is compatible with Linear garage door operators that use the HBT drive belt. Compatible with the LDO33, LDO50, LSO50, LCO75, LDCO800, LDCO850 and LDCO852 models that use the HBT belt rail. Replacement includes the Sprocket Holder (217811-001), Belt Clamp (220905-001), and Grease (219578).