5-1/2" version of 82-227

I emailed about a problem with my order a little while ago and have more information to provide you. I believe Item 82-227, which I received, is actually measured from the center of the top mountain screw hole to the center of the bottom screw hole. When I do this, the product measure's 5-3/8" in length, as listed on the packing slip. This is slightly too long for what I need for my Hurd sliding door. Is there a mortise lock that measures 5-1/2" instead? Thanks, Lori Moss