Here is a link to some that look similar to mine and show the shape of the clamps(or whatever they are called haha)

ICBEAMER 50" 120cm Silver Aluminum Travel Camping Roof Rack Top Railing Cross Bars Cargo Carrier Luggage w/Key Locks https://smile.amazon.com/dp/B085X3TV75/ref=cm_sw_r_cp_api_glc_fabc_ud69FbHSZY3M2