These are the covers that belonged over the straps to make them more comfortable. There are only two. These are from one seat, however they are made in different material. No idea why. We have no use for them now, so I'm selling them. 

They are approx. 4.35" in height. Measuring across rolled up on one side, they're approx. 2"

Unrolled, they are approx. 6.5"