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Do any of the numbers listed here relate to what bearings I need?
https://www.giantbikespares.com/Giant-AnthemX-29er--Anthem-27.5--Trance-27.5--Reign-27.5--XtC-Overdrive-Headset--1310-NO57AA-112_1310-NO5752-001/product_detail/3-41313
If you can get the bearings out see if there is a number stamped on the side. It may be a bearing that you can get from a bearing supplier.Bike shop charged me £80 for new headset bearings fitting.Taking it apart they just drop in and I bought a pair on eBay for £12.
Bearings are out ,can't make out the numbers.
I recently changed headset bearings on a mates Reign advanced, he bought the whole headset (fsa branded)for around £35 but not sure where from, although I only swapped the actual bearings. If you can't find one have a look at kinetic bearings website, I'd be surprised if they don't have the right bearings. If numbers aren't visible I'd measure them with a vernier gauge
Kinetic do them as a set: https://www.kineticbikebearings.com/giant-overdrive-od-mountain-bike.html . They have advice on how to double check they are the right ones.
Top bearing is 30.15x41x6.5 36/45 with code MH-P03K and bottom 40x51.8x8 36/45 code ACB518K.