The 2 longer studs (part# 90031-KV3-000) are used on the lower head to secure the bottom radiator mount.
If your Honda dealer can't get you the original parts just try a good auto-parts store or jet-ski/waverunner dealer for something similar. The studs are a slightly awkward size as they are M7, but any M7 stud can always be cut to size.
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