Originally Posted by JesseT

If the thread on the RS plug (in picture) is only half the length of the Mondeo plug as you state, I'm having a hard time believing it's double that length! I'm for one using the RS Focus plugs, and they fit perfectly to a standard silver top Mondeo zetec head. You must have compared the wrong plugs. You can fast google some pics of both of these and they look pretty much the same length.