Craftsman 8' RAIL EXTENSION KIT # 953728 Belt Drive Garage Door Openers. Compatible with CRAFTSMAN garage door openers. 5 out of 5 stars (3) Total Ratings 3, $44.99 New. 041A5665 is a 7 ft. Square Rail Assembly Replacement Kit. 8-ft Belt extension kit used to successfully complete Garage Door Opener installations on garages with 8-ft garage doors. 4.7 out of 5 stars (15) Total Ratings 15, $22.50 New. Craftsman 8-ft Garage Door Opener Rail Extension Kit 53726. Genie ChainDrive 550 Garage Door Opener - Heavy-Duty Chain Drive System - Includes 2, 3-Button Remotes, Black & Chain Drive Garage Door Opener 8ft Rail Extension Kit 4.6 out of 5 stars 908 179.14 … The Sommer 1628V008 garage door opener 5-ft rail extension kit from Garage Door Supply Company will extend the reach of a Sommer Synoris garage door opener rail for 7-ft and 8-ft high doors to accommodate a 12-ft or 14-ft tall garage door. Craftsman 8' Rail Extension Kit for BELT DRIVE Garage Door Openers … For use with various LiftMaster® and Chamberlain® Garage Door Openers; installed on a 7 ft. garage door. Includes steel rail extension, … Complete kit includes: (1) Front Rail Section, (3) Middle Rail Sections, and (1) End Rail … The 10 ft. Belt Rail Extension Kit is used to complete garage door opener installations on belt drive garages with up to 10 ft. garage doors.