Hello. My name is Michael. I will help you with your question today. Do you still need assistance?
If you could please attach a photo using the paperclip icon in the toolbar, I can use that to help.
Thank you. That estimate is very high. I don't think these were on the set originally, but added at some point.
You can get a number of different replacements. But it will depend on the size that you need. A precise measurement of the insulator and the size of the screw would help in getting the exact one.