Nice score. Just thought you'd like to know, the bass you have is called a G-33. The GR-33B is the floor module only. There's a good page here with information, although it focuses more on the G-88, which is the older brother of your bass.
http://www.joness.com/gr300/GR-33B.htm
The page also discusses the relationship between the bass and the Fuji Gen Gakki company, who made some Ibanez models.
If you decide to look for the module, you need to do some research to find out what's suitable for your bass. The module that was released with your bass was the GR-33B. The later GR-77B was intended to be used with the G-77 bass, however, according the the link above, there is a way to make it work with the G-33 and G-88.