erm.. could you pls explain a little more on what you mean by 'fit very tightly'?
i just mean that the floyd block will have almost no room to move around in the old trem rout, but sometimes wont fit at all. if it does fit, it will be so close that it wont have any clearence to move side to side, and might not fit the bushing for the arm. but i have a rhoads guitar template that has a standard trem rout, and a floyd fits in that, but like i said, very tightly, and the intonation might be a little off. what you could to is get your floyd, take out your other one, and just see if it fits.