2003 Ford Everest

Hi experts, I have two problems with my everest.
1)i need your help where I can find available original ford glow plugs for my everest.I bought replacements. But I wont last for sure. Also can you please send me some pictures or specification if in case you have.
2)My idler arm assembly bushing is worn out. Is it ok to do some repairs. Change with rubber bushing?
Thanks you very much.