That is a good price. The parts retailer is reputable so should not have any problems with the part. A bit fiddly to fit with all the hoses and connectors. While the manifold is off you might want to check the state of the inlet valves. They tend to get coked up with carbon and can only be cleaned with the manifold off. No chemical cleaner additive can touch it. Hope all goes well.
Just checked chain stretch on my 2010 using VCDS and still within spec at 67k so happy at present.