Where do I find those written on?

Hi mate.
Lift the bonnet and at the front, above the rad you will see a plate.
On the plate is the codes. Good luck.
Cheers Mark.

In this pic, "184-5" is the colour code:

2012-01-06_12-25-34_715.jpg by macplaxton, on Flickr

"15" is Market Code.
"6372" is Trim Code (interior)

See also: http://www.volvoclub.org.uk/vin_300.shtml

360: Engine number is stamped on the engine block behind the distributor.