I believe all replacement kits will have vinyl sides and leather panels where you sit and lean back. Easy to spot if already installed by taking a picture and viewing it on a monitor. You will see the slight color differences between the leather and vinyl and grain. Of course contacting the vendor for clarification on leather content is your best bet. Vinyl on the sides allow for better stretching and fitting then 100% leather, even metric tlc kits had vinyl sides.Thanks for the info. I wanted to make sure they were not leather/vinyl combo.