Edit - I updated this first post on 8/2/10 to reflect the additional info collected so far. Thanks for the help and feel free to offer further corrections or info. On another site someone was just asking about the correct color for the motor in a truck kit, this got me thinking it is a pretty common question and since there is a fairly limited number of truck engines available in kits or resin it could be handy to make up a list of the colors so we have the info in one place.