Regi,
In an effort to streamline our DLSR housings, the newer style housing tray does not accommodate space for optional lead weights. Since most DLSR housing users attach underwater strobes, space for additional weight was not factored in the design change.
That said, I do have an option for you. We sell a NiMH Battery Pack Pouch that attaches to 1/4-20 female threads in the base of your DSLR housing tray. You could then fill the pouch as needed with lead diving weights (available at any dive shop). Also, the pouch is collapsible for easy storage and shipping.
You would need to order #1401.1 Single Battery Pouch ($25) and #1401.4 Ikelite Housing Mount Kit ($25). You can order from an Ikelite dealer or call Ikelite customer service direct with a Visa/MC at 317-923-4523.
Regards,
Brett Foster - Ikelite