If according to my divorce papers I am supposed to receive a car from my ex that was given to me by my in-laws, if he doesn't give it to me can I seek money for it?

If your Final Judgment and Decree (which would include any agreements incorporated into the court's order) awards the vehicle to you, then you are entitled to receive the vehicle. If your ex husband fails to comply with the court's  order, you should retain the services of an attorney to file a motion for contempt.  As part of the motion, you can request attorneys fees, in addition to the incarceration of your ex husband until he complies with the court's order.