Sorry if this has been covered but I am a bit confused on the front arms for these new cars. The pictures show the mid car to have "gull wing" arms and the rear car to have straight arms. In looking at the parts lists there are 2 different front arm parts (Part #: 91398 and Part #: 91526) plus the hard arm options. Can we assume this is a tuning option and the kits will come with both parts in each kit