READ TO THE END. CASH ONLY. $20.00 EXTRA CHARGE TO TELL YOU NO WHEN YOU ASK IF I TAKE ANY KIND OF ELECTRONIC TRANSFER. GARAGE DOOR SPRINGS ARE MADE AND BALANCED FOR A DOORS SPECIFIC WEIGHT. SO YOU ASSUME ALL LIABILITY WHEN YOU START ADDING MORE STRUTS (WEIGHT) TO YOUR DOOR. TEXT ONLY. The 18' struts ($80) are 3"and the 16' ($60) struts are 2". 16' and 18' garage door struts $60.00-$80.00 per strut