round,shiny metal end cover for 3 on the tree

Am looking to buy a 1967 barracuda manual transmission column shifted shiny,round metal end cap found on the end of the 3 on the tree shifter.Mine fell off somewhere in it's near 47 year history.I believe they might be glued,or press fitted,to a threaded plastic piece (mine is black) which then is connected to the main chromed column shifter.Thanks.