I'm here to serve The numbers represent the the type/brand of strut/shock you intend to use in conjunction with the GC. You must know which or else the sleeve for the GC will not fit the strut correctly.
Shock Codes:
1) Stock, Sachs, Boge
2) Tokico Premium (blue)
3) Tokico Illumina
4) Koni
5)Bilstein
6) Neuspeed Bilstein
7)KYB GR2
8)KYB AGX (adjustable)
9)GAB "R"
10) GAB "HP"
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