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Your GP338 would need to be reprogrammed to one or more of the frequencies available in the T5720. If you are using the interference code eliminator, it would also need to be programmed into the GP338. Take your GP338 to your local Motorola dealer for reprogramming.
So sorry, parts have never been available for the TalkAbout line of radios (other than TalkAbout Distance & DPS). If you are looking to repair an existing T5720 unit, your best option would be to locate a like-model for parts. eBay can be a good source.
The frequencies in the TalkAbout T5720 are not adjustable. The radio operates on the designated Family Radio Service channels located at 462 and 467 MHz. There is no way to change these channels to be at 463 and 464 MHz.