Thanks for your interest in Ikelite products. For your camera setup you would need:
#6809.1 Housing for Nikon D90
#5510.45 8" Dome Assembly
#5510.10 Superwide Port body (for use with the Tokina 10-17)
#5510.28 Extended Port Body (for use with the Nikon 18-105)
#5510.18 Special Zoom Sleeve for the Nikon 18-105
The #4118.2 dual sync cord can be used to connect your two Sea & Sea strobes to the housing. The circuitry inside of the housing will not be operable with these strobes, the strobes can be used in manual power settings only.
Regards,
Jean / Ikelite
IKELITE Underwater Systems