The Yakima PlusNuts replacement part # Y8880039 is the optional hardware kit for Yakima roof rack tracks # Y01126 (42 inch) and # Y01127(54 inch) and are made out of steel.
The roof-rack tracks are an anodized aluminum so you wouldn't have any issues using other types of metals. view full answer...
The B&W ball mount # BWBMHD30010 is made in the USA. This one is 8-1/2 inches long but there is a longer one, # BWBMHD30011, which is 10-1/4 inches long. view full answer...