Hex Nut Expandable Neoprene Rubber Plug with Steel Hardware, 1/2" x 11/16"

Update of my review below. This should be considered only a temporary fix. Took a long trip on the bike with this plug in, and during the trip the plug fell out and I lost my transmission fluid. Fortunately I had purchased a second Plug and had it with me. A local guy came to my rescue with getting me some oil for the tranny.Unfortunately I stripped the transmission plug on my Harley Davidson, and after several attempts at other fixes, use of the Hex Nut Expandable Rubber Plug solved the problem. In fact, I bought two of them. I saved hundreds of dollars in repairs for cheap.