gunrunnerjohn,
Those will work just fine, I happened to like the smoother ones but these are almost identical.
John H,
Just so you understand what needs to be done, the post going into the back of the female Banana plug must be removed by unscrewing it, be careful not to damage the threads, then the female Banana plug screws on to the Lionel Transformer post.
Simply remove the nut from the Lionel post and screw the Banana plug on. I used slightly different female Banana Plugs that had flats on the end, to make screwing the Panana plugs on a little easier, the posts John recommended will work however.
PCRR/Dave
Note the flats on each side of the post, that post must be removed. I use these flats to hold the Panana Plug securely in my mini vise, for removing the post and also for screwing the female Banana Plugs on the Lionel posts, more than just finger tight.