KEMET 3121 & 3171 special packaging codes

Is anyone aware of the exact meaning of these packaging codes by KEMET?
3121
3171
e.g.: C0603C104K5RAC3171
I have search results with these packaging codes at the end of the MPN, but nor the series datasheet nor the C spec guide do not include the exact meaning of these codes. Is it just reel size? or does it affect the reel material or the pitch distance?

Thank you!

Hello,
Welcome to the Digikey tech forum. Iā€™m checking on these and will post when I get the information.

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3171 is a direct customer automotive cspec , 3121 is also a direct customer spec.
REELING: 7 INCH, PLASTIC (0603, ARRAYS, 0603 AND 0402 ON PAPER) AUTOMOTIVE
REEL PER IOD 100-040-CI
CUSTOMER IDENTITY-AUTOMOTIVE