I got the lego technic Quad Bike for Christmas and I was very excited about the shock absorbers ( three of them!) but I realized that the gray ones are not the same as the yellow ones. Two differences (1) different spring (2) easier to squish. However they do have similarities (1) same length (2) same squished length. I am having trouble deciding which ones to use in my upcoming creation. Help me with it and leave a helping comment.