I don't see a Q510-5-3

PANTONE Q510-3-2 PANTONE 1665 C 2-18-3-2
PANTONE Q510-5-4 PANTONE 2613 C 2-18-5-4
PANTONE Q510-5-5 PANTONE 2945 C 2-18-5-5

I copied the bolded cross-reference above and...