My apologies if this is off topic, but I'm desperate for an answer!
I've gone to service my headset today, and as the bike shop put in loose ball bearings, they have gone everywhere and I've managed to lose 4.
I'm therefore looking for a new headset, ideally with cartridge bearings, but I'm really confused by all the different options.
According to Trek's website, the headset is an FSA 1-1/8" threadless, semi-integrated. I've attached some photos of the relevant parts.
Could someone please suggest a suitable replacement? Many thanks!