If you already have the 47" Thule SquareBars # TH712200 then the only other parts you need to complete the roof rack for your 2015 Lexus CT 200h are the Traverse Foot Pack # TH480R and the Fit Kit # THKIT1636.
Since your CT 200h doesn't have pre-installed fixpoints for a roof rack you actually need to use the Thule Traverse Roof-Rack Foot Pack # TH480R. The Thule Podium Roof Mounted Foot Pack # TH460 is designed to work with vehicles that have the pre-installed fixpoints so it won't work... view full answer...
Since the bars on the Rhino Rack ROC25 # RR65QR are 37-3/8" long, you'll want to use the Rhino-Rack Fairing for Roof Racks - 38" Long # RRRF2, which will sit right about even with the outside of the legs and provide you with full coverage of your crossbars. This is going to do a great job of reducing the wind noise and is exactly what you're looking for. view full answer...