I have several Atlas O Front Runner cars that I purchased awhile ago from the Bay. These are all 2-rail models with scale wheels. I would like to install hi-rail wheel sets but I can't find the hi-rail needle point axles. These cars have a single axle at each end. I looked on the Atlas web site but I couldn't find them. Would anyone have an idea where I might find them? Would the wider flanges cause a problem with the existing trucks?