I ordered a new wiper motor on ebay, it got here it was very close to fitting, but it would not fit. Part number WIP1664. It said for 03-2010 dodge ram 1500. So now I have to return it and get the one that fits. So my question is how do I know which one will fit. The center bolt that comes up in the motor assembly was wider than my previous wiper motor and was just barely too wide for the wiper blade assembly piece to fit over it where you fasten it down with a nut. Has this happened to anyone else / any advice?