I wouldn't go with a Kahler in ine of those, you would have to fill the entire trem cavity, then re-route for the Kahler. A member on here (can't remember who) just put an edge pro into their's, and it was a drop in replacement, so I'd go with that :2c:
Found the thread - http://www.sevenstring.org/forum/luthiery-modifications-customizations/168908-s7420-lo-pro-7-swap.html
Found the thread - http://www.sevenstring.org/forum/luthiery-modifications-customizations/168908-s7420-lo-pro-7-swap.html