I'm not sure what you are asking.

Any car running on 27MHz (which is common for toy-grade RC's) will run on 1 of 6 channels. First, you will have to know what channel your car is on. It may be on a sticker on the bottom of the chassis or you may have to open it up and look. Then, using that information you will have to get a remote that is on that same channel.

This is all general information. If you cannot determine what channel your car runs on, you are shooting in the dark trying to get a remote for it.