On a computer, click on support and you should get a drop down menu, choose Schematics. On the next page, there should be some tabs, the first one is to search by serial number. Click the third tab from the left, "search grill family". On the next page, select country, then grill type (gas, charcoal, etc), then chose from the drop down under "grill family". This will bring back a listing of various grills. Click on the one you are interested in and you should be taken to a schematic.
On the schematic, find the part you want, click on the number next to it. This should bring up the actual part number.
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