26 February 0 Comments Linear HCT Garage Door Opener Chain Rail Posted by mega in Categories HCT Chain Rails Model Number: HCT Product Number: HCT Product Links: Models compatible with the HCT Features Available in 7, 8, or 10 foot lengths. Pretensioned chain on T rail. One-piece rolled steel construction. Interchangeable with LSO and LDO heads. Flush mountable to ceiling. Replacement parts diagram click here.