When you garage door spring is failing it can cause damage to the door itself. There is nothing worse than a relatively inexpensive part causing damage to an expensive garage door. I found single spring garage door springs that fit a variety of doors at amazon. Their site makes it easy to compare the different makes to find the one you need. The springs are sold in pairs so that you can fix the whole door and make sure the sizes are right. Fixing the door and springs is pretty easy. You just need a few different wrenches and some pliers. And having another pair of hands around won't hurt either. A single spring garage door does not have to be difficult to find. Single spring garage doors are available in various sizes and styles. You can find single garage door torsion springs, overhead garage door single springs as well as garage door extension single springs among other products. A garage spring can certainly prolong the life of a door. No matter whether you're looking for garage door spring replacements, garage door opener springs or garage door side springs, you're sure to find a model that fits your particular door just right. 
Holmes One Piece Garage Door Spring P928 (Single Spring)
"Holmes P928 one piece garage door spring. One spring included. There are normally 2 P928 springs on a single car aluminum one piece garage door one on each side." 
Holmes One Piece Garage Door Springs P728 (Pair)
"Holmes P728 one piece garage door springs. There are normally 2 P728 springs on a heavier 2 car 16-foot wide 7 foot high or larger aluminum one piece garage doors one on each side. Two springs included." These door springs can be found at amazon.com
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