dealer locator in php

I have 2 sister sites that need a dealer look up. Users would enter zip code or postal code (in canada) and model and it would return the nearest dealer info and map. They can could choose the near nearest dealer... the look up would use data uploaded nightly to get current data. I will attach samples of the 4 files to help get an? estimate? together. YOU MUST HAVE DONE SOMETHING LIKE THIS BEFORE AND SEND A SAMPLE LINK TO THAT WORK!