I tried the search, but didnt "really" find the answers I was looking for. First question. What size are the two hex heads holding the adapter to the block? Second question. Do I have to drain the oil to do this fix? Third question. Do I have to disconnect the oil cooler lines from the adapter? If so, what size is the nut and how do I get a wrench or socket in between the two lines? It seems pretty tight in there. Fourth question. What o-ring do I use from the kit? The round or square one? Sorry for all the questions. Thanks for the help!