CX-9 roof rack (OEM)

When you install a roof box, do you put any protection between the box and the OEM cross bars to prevent the cross bars from scratches?
 
my old Yakima sky box had rubber pads on the clamps. when the pads wore out, instead of buying new ones, I wrapped the bars with tennis racket grip tape at the contact points. It worked fine.
 
I can't seem to find the Suzuki Mont blanc roof part… I tried googling several different ways and searching eBay. Does this still exist for $150? Anyone have a link? This seems to be the best option for looks as well as strength as they are rated at 220. I realize the rails are still rated at 100 but it won't hurt to be sure and may help the strength.
 
They might be harder to find in the US since American Suzuki Motor Corp went bankrupt and no longer sells vehicles here.
 
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