If you just need bulbs, 893s (35W) or 885s (50W) are the standard replacements. Walmart or an auto parts store should have them. Remove old bulb by reaching up through access windows on splash guard and turning old bulb 1/4 turn CCW. Unplug old bulb from wire harness, connect new bulb, and re-install in fog lamp. (Best done laying on your back.) Why does the dealer want to replace the lamps?