You are correct that the Solera 14' Slider (Slide-Topper) in Black w/ Black Hardware # LCV000168110 or white # LCV000163301 is the correct fit for the measurements you gave. This fits measurements from flange to flange of 158 to 163-3/4 inches. This comes with all the hardware needed to install except for the Butyl tape like # 344270341411-1 or silicone sealant like # 344270341437-1.
I've attached some videos of the installation to assist. You will want to have a second set of hands... view full answer...
I'd give the Tekonsha item # 90195 the edge for ease of use. The full LCD display provides the status of your braking system at a glance, while the item # RED44FR Redarc Tow Pro Elite uses colored LED's to indicate problems. The display of the P3 is much more intuitive and user-friendly.
However, some folks absolutely hate the appearance of a typical brake controller and want it to be as hidden as possible. If you fall into that camp, the Redarc Tow Pro Elite might be a better choice.
Performance... view full answer...