You already have a modded Saturn? Total conversion or just 60Hz?
It might be worth a drive swap for a total conversion (60Hz & Region selector) but in that situation you'll just have to be research the 4 (?) different CD-loaders and do what you can to increase the odds you buy one with the right replacement drive.
Or in fact with nothing to loose you could try to adjust the laser potentiometer on the unit you have first?