Ed, Be careful what you buy. I purchased some brown plastic bumpers Lionel p/n 6-12717 a few years back on Ebay. They appeared to be new-old stock made in China for Lionel LLC in the 1998- 2003 time frame. Looked in perfect condition at the time but recently while reassembling my layout after a move they are very brittle an literally crumble in your hands when installing them.
Gerry