You're welcome. A good reference place is eBay,you can get some decent info from there without going and buying books about them. The books help to give the info that is hard to find on eBay,but to get the most recent Hot Wheels guides will set you back $60 for the pair which isn't worth it to a non-collector and I don't blame them for not buying them.
This set is from 2004. The dates on the bottom of the vehicles is the original casting date of that particular model,that doesn't mean that car is from that year which means that these cars were made in 2003 to be in this set.