There's only 45° or 36°(from the top of my head, I may be forgetting something), it's not hard to spot. Check inside, outside, height and angle and buy the same. Or try to find what headset came with the bike.
@Netakure started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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There's only 45° or 36°(from the top of my head, I may be forgetting something), it's not hard to spot. Check inside, outside, height and angle and buy the same. Or try to find what headset came with the bike.