Code 45 would be for a MK6 Cabriolet I believe, not sure why they would have used that over the 57 code for 4 door Golfs. That is what most of us have coded.
I've also realized that all of the volkswagen-accessories.com links in my OP have died (for information and codes on the VW site). Unless someone finds an updated site, it looks like VW has taken the site down.
thanks for the reply! ill keep it at 57 then!