Attempting to install an after market stereo in my 06 Durango and can't seem to find the right adapter. The OEM unit has a 22 pin plug and a 10 pin plug (only 3 in use) but the adapter (scoche cr4000a) only has the 22 pin. Anyone have any ideas here, what is the purpose of the smaller plug, the wire colors are ltblu/rd, grn/yl, and drkblu/wt.