Hello guys, i have a Fezzari road bike that ive just bought, its carbon frame and i found out that the headset bearings need a replacement.
when i disassembled the headset i noticed that unlike usual bearings with two "open" sides my bearings had one "open" side to them and a second side that is metal cast.
Here are some photos to explain

Regular bearing with two open sides.



my bearing with one metal side.




can you tell me whats the difference between those two bearings and also can i use the "two open sides" bearing to replace my unique one?

thank you.