I’m guessing the new shocks may or may not have a different shape than the 18’- versions that might interfere with the current liners.
I have an 18’ and have the husky liners, one of the first if not the first to install them as a customer. They required a lot of work to make fit, I had to do cutting to the lower front of each side to get them to fit. I talked to Husky about it and saiid they would look into it but never heard back. It was very frustrating, I have no idea how they thought the fit was right because they certainly were not and I’m no amateur to this kind of work as I have designed many vacuum formed parts and custom made plastic shrouds and mud flaps over many years.
I hope they made the needed changes and fit properly for everyone’s sake that purchases them.