Hi John,
You can use the LockRack Watersport Carrier Universal Crossbar Adapters # LR53FR.
I verified for you the distance from center to center between the bolts is 3-3/4 inches, not 2-1/2 inches, so these will definitely work for the 2-5/8 inch wide crossbars on your 2020 Toyota Highlander. view full answer...