ok before i buy a twin seat and peg/rear axle assm . did any of these come out with them from the factory? ironheadmotors has the set for 400.00 and says nos i think .. is this corect as i do not want to do anything to alter this stock bike to take away from its collectiveness, also do i have to change the rear tail/fender as well..?/ and where the best place to get them