Try this. Go to https://www.lionelsupport.com/. Search by Product, enter 6-14588 into the text box and click the Search button.
This will bring up several possible options. You will need to decide which is appropriate to your engines.
![Lionel Support Parts Search Lionel Support Parts Search](https://ogrforum.com/fileSendAction/fcType/0/fcOid/158955947792755808/filePointer/158955947797057884/fodoid/158955947797057880/imageType/MEDIUM/inlineImage/true/Lionel%2520Support%2520Parts%2520Search.jpg)
Clicking on >View Parts will show you multiple pages of parts for the selected model. Once there, each part will usually have a description, clickable photo of the part, price, and option to buy directly from the website.
I hope this is helpful.