Already had a fuel injector replaced under the Ford extended warranty. As most already know they only replace one that actually fails and not all of them. So noticed a little kick here and there when engine is cold. Thought I better just replace all of them since its more then likely the same issue and it may lead to bigger problems like some of the horror stories I have read here.

Thinking of ordering these:
http://www.sarad.com/productinfo.aspx?p=181759

or these:
http://www.rockauto.com/catalog/rafr...067378-3300836

Anyone have any experience or knowing of these? Is Motorcraft a must?