What lengths? Assorted could mean 10 ft 15 ft and 20 foot, or it could mean 1 foot two foot three foot. I'm looking for short pretty specific lengths.

SmartStraps.com states that this model number is 34” long. Obviously, the slots allow shorter tie-off points by simply relocating the S-hook.

The assorted length means the length is adjustable to your need. If you look at the Tarp Strap itself, there are holes the length of the Strap. With looking for a short length, this product should work for you.