Volvo 850, C70I, S70, V70I, V70XC interior codes:

See the product plate at the left side of the engine compartment. The 4-digit code (e.g. "3380") in the 2nd row of the right column is the interior code.
The "x" is a variable.
Application example: items which are displayed as suitable for Interior code 3x80 have the correct color for vehicles with interior code 3080, 3280, 3380 etc.