I went to the local Lexus dealer to ask for lug pattern size and they could not tell me. I have seen 5 by 5 1/2 and I have also seen 5 by 150 are they the same? I also have a Dodge Ram that is a 5 by 5 1/2. Does this mean the wheels are interchangeable? I want to put 20" rims on my Lexus - any suggestions?