Jinx, IMHO this is what my thoughts are......good idea about the sponsorship...
bad location on ebay...
If I were you I would take in some pics of your car to the local parts stores and service centers and see if they want to advertise via window decals for a certain length of time........or which may be a reach but since you are a "proud" fireman ask if the local station would have a fundraiser or donation and place your stations # on the car with the donator's names.........