Hi!
To change the hinges, there's two ways.
Either (the more common) is to replace the whole top section with both frame and display. If you would want to do that then HP's maintenance and service manual should suffice, I've linked you to the display disassembly section.
If pdf link breaks, you can find the maintenance and service manual among the manuals and guides on HP's Support page for your device.
The other way is by replacing just the hinges. You would then need to follow the maintenance and service manual to take of the display assembly, and then you would also need to remove the monitor from the frame, which HP EliteBook x360 1030 G3 Screen Replacement shows how to do (similar model). I also found this Youtube video which shows the same thing.
Where to find parts is something we does not always do, as availability and different region means that a market for me likely won't work for you. So my recommendation would be to use your favorite search engine and search for "HP elitebook 1030 g8 hinges / screen assembly / display replacement" in ordered to get localized results that works for you.
Good luck with this,
Cheers
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