Manufacturer's Website: The first place to check would be Visiontek's official website. Look for a "Support" or "Downloads & Drivers" section, and sometimes, you might find a subsection for spare parts or accessories.
The most intelligent users of the Visiontek GL-11 do not wait for failure. They build a small spare parts kit containing: Visiontek Gl-11 Spare Parts
Below are the primary replacement components available for the Visiontek GL-11: Manufacturer's Website : The first place to check