I have a question about a 4" over arm. I bought what is supposed to be a 4" over arm. I measured it against a stock arm and it seems to be 2" longer. I measured from the center of the pivot to the beginning of the axle adjustment and it is 2" longer than stock. Am i missing something. Sounds like a dumb question but i want to make sure i have got it right before i contact the seller. Thanks