While genuine roof bars look better I'm not convinced that practically they are the best.
I have used Thule roof bars for years and are my bar of choice, used them way before got the 75. They are as solid as a rock and have never damaged the paint work.
Thule 754 or 750 feet one is just the later version, you will then need bars and the fitting kit.
Don't buy new as they are expensive but search ebay for what you need.
Check out the Thule web site for the reference numbers of the Thule parts you need
this is cheap cheap cheap
https://www.ebay.co.uk/itm/Thule-750-Foot-Pack-754/193454665621?hash=item2d0acbef95:g:SGEAAOSw9tFes~s j
but I don't think has locks
macafee2