There are two different plugs for the B&W Turnoverball Gooseneck Trailer Hitch, the part # BWGNXA1710 which attaches to the hitch ball assembly and covers the opening in the bed while the hitch ball is in the stowed position and the part # BWGNXA1715 which covers the opening in the bed with the hitch ball assembly removed. These are the only two plugs that B&W offers for the B&W Turnoverball Gooseneck Trailer Hitch. view full answer...