This is simple step change the radio button background and making a step by step Tab concept. Try this coding make on few steps follow having a style Tab with using radio button.
Copy the bellow css this is directly called the radio button class so don't use class name call the name in coding input[type=radio] and Label this style hidden the original radio button design. so the label similar function on radio button watch Label coding.
Script function on Toggle method just show and hide the Div. the Radio button value and class var test = $(this).val(); the div value increased $("#Cars" + test).show(); selected radio button value div will be showed.