Missing RPO codes.

I went through the list of RPO codes from http://gm-trucks.com to find out how my truck was equipped and there were a few on the sticker in the glovebox that weren't on the list. I found out the important stuff (3.73, 4L80E, Z85, Z82, etc.) but I'd like to know the rest. Does anyone know what these codes are for a 2000?

A31
A95
FT2
FT3
SLL
V22
V73
VXS
XGK
YD3
YD6
YE3
YGK
ZGK

There were also some that began wth numbers but they looked like the packages. I think the last 5 are for the tires since they're only one letter off the tire codes listed.