I am just tall enough (6' 1") that the seat belt pops out of the plastic guide at my left shoulder. I used a product called Shrink Wrap from an electrical supply store. It comes in a grey colour very similar to to plastic guide and in a perfect size so you don't have to apply heat to shrink it to tighten it up. It can be removed and reapplied. I like my solution but am wondering if there is a better one.