I only got one key/remote for my 2003 Disco and have seen several up for aucion on Ebay. But I have no idea what the frequency is for my key, it only has a part number on the outside. I want to make sure I get a key/remote that will function with my car. Is the frequency code listed anywhere on the inside? I tried to pop the remote open but it doesn't budge much and I don't want to force it and break it. Any ideas or do I need to get the dealership to tell me the frequency.

Chris