Roof Liner Elastic Straps
 

Does anybody know the original length of the elastic straps that hold tension on the roof liner? Mine are stretched to the point where weekly maintenance now includes re-hooking them to the post--a tedious process that I've nearly perfected using an alligator clip duct-taped to an old radio antenna.

I can clearly see they are too long, but don't want to make them too short and create any other problems.