That bass has a narrow, 16.5 mm string spacing, and there are not even that many aftermarket fixed bridges for that bass.
Here is a fixed one:
http://www.warmoth.com/hardware/brid...n=schaller_496
Hip shot has a trem one that is available in three different string spacings, but not narrow enough for you:
http://store.hipshotproducts.com/car...t_detail&p=143
If you like Ibanez basses , you may need to look at their BTB series, which has a 0.75 inch or 19 mm string spacing.
And...you know, you really need to get "tremolo" added to your thread title. If that is what you are looking for, you would get more help in that direction. Your current thread title is just going to drag in guys like me who are frustrated with the lack of aftermarket fixed bridges for Ibanez SR series.