You will need to change the bumpers and rear wing mount - thats it. Then you can use any 17mm 1/8th buggy wheels as well.
Here are the part numbers
bs903-009 front bumper
bs701-031 rear wing mount
bs701-032 rollcage post set
bs701-033 front body mount
bs701-034 rear body mount
bs803-003c clear buggy body
mpo-01 17mm wheel hex kit

Hope this helps [8D]