So can someone else confirm the size? I don't have a deep socket 22 or 27 mm. While I can certainly buy both and return one, I'd like to just get the right part the first time. Or should I just skip removing the knock sensor and just keep flushing the crap out of everything both using regular "fill and drain" methods as well as using a flush kit (with a piece of extra heater host so that I don't have to cut mine)??? I am going to replace the Dex-Cool with the yellow "All Makes / All Models" yellow so there shouldn't be any 'turning to jelly' issues...