sorry ran out of room, as i was saying.....you dont have to find the actual remote that came with this, just one that has the same functions and frequency, so your best bet is once you have the frequency number if you can find it is to get on ebay and type in for example nikko radio control and usually you will find a long list of remotes you can buy, you could even buy both frequencies if you cant find yours anywhere on the truck, you may even get lucky trying some old nikko remotes because nikko changed there frequencies ever so often like say 27.135 to 27.125 so even if one doesnt work the next one might, also some of the nikko and radio shack remotes have an interchangeable crystal on the remote itself where you can buy different crystals to plug in to change frequency, ive seen remotes on ebay like this with 5-6 dif crystals included that you can change out. lastly if all else fails, find a donor 7.2v r/c truck on ebay for cheap and swap the electronics out and use its board.
sorry about my real in depth reply, but i was bored.........not so much now though.....lol