The only mod for the 97 is the discriminator tap. I have Bill Cheeks Radio Shack Scanner Mod book in great condition if you want it. email me kilowattradio at gmail.com
The major difference between the 2005 and 2006 was the replacement of the dimmer switch with an on/off type. That is why you will usualy see both models listed when you look for mods for either. So in your search, include them both on the title to help you. This is a great place to start: mods.dk - Modifications for radioamateur