This plug is hard rubber like the rubber plugs in the floor. It is 2 1/4 X 1 3/4 inches and oval shaped. located on the right side of the trans hump toward where the tranny would be bolting to the bellhousing. what was there was a piece of 30lb roofing felt glued to the trans hump. Just thought I might find the correct piece that goes there before putting my soundproofing down and new carpeting..