Gray,

Well, my Radio is JR XF421 EX, and You can look up the pictures of the back of my radio on google images. I picked up an image from there, and most likely I understand that I'm outta luck. As this model is easily 5 years old. I'm gonna attach a pic of the other radio which is JR's different analog model not digital. So I can understand I'm outta luck, I don't think it has any slot to be replaced by 2.4 module.

Thanks

Mody