To tighten there own hitch in my receiver I need one that has a shim on both top and bottom not the side. This is my 2nd pair of these and I only had to get another pair bcs one of the straps (there are two so technically I can still use them) on one of the flops ripped out of the bed so I got another pair. They seem to be of lesser quality as well. I also they fit perfectly for me! It?s almost like an old aftershave battling a new smooth citrusy smell. The vendor though. I looked through the owners manual to see troubleshooting answers and came across a hazardous substances chart and found that it contains amounts of lead in the body of the earbuds that go beyond regulations (GB/T 26572) I am returning mine today. Not a big deal, but still worth mentioning. So I put them on and could tell that they werent the same shoe that I had been wearing for all those years. The Velcro was strong and worked well.