Roof Rack End Cap

Over time I lost 3 end caps to my roof rack carriers. I just designed in TinkerCAD. These fit on a bit tighter so they are less likely to come off. I may make a wood plug for inside the carrier and put a screw up through the bottom of the end cap and into the plug inside the carrier arm so it would be really tight but might not be required.
Inside diameter = 1.188" x .875"