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Koni Yellow have perches on which the spring sits on. Yellow can lower up to 1" more so your Prokit with a 1.5" drop can actually be lower up to 2.5"
Mine are on the default perch. I don't *think* it's possible to use these springs on a lower perch. They're just barely long enough (uncompressed) to fit flush against the upper mount at the default perch.