I purchased the Bakflip G2 for my 2015 Ram 1500 with the 5.7ft box. After the install I noticed that the cover sits up slightly higher in certain spots along the rail and isn't flush. I was looking online and it says that I should have received shims to use with the install for my make and model. However, I did not receive any shims with my bakflip. Can these be sent to me separate and will it resolve my issue of the bakflip not sitting flush?