The selected Commodore V6 package is more than the main bottle: it includes the tall removable filler neck and cap shown in the photographs. Keep those items in view when comparing an assembled image with a photograph showing the neck detached.
This is the black 3.8L V6 reservoir configuration. It is different from the translucent LS1 V8 expansion tank; a broad VT/VX/VY description does not remove the engine distinction.
Keep the V6 scope and reference together
The VT/VX/VY V6 overflow tank with filler neck is listed for Australian 3.8L petrol applications, 08/1997–08/2004, using reference 92101621.
Check the VIN, actual build month, engine and original number. Another Commodore engine or series needs its own application confirmation rather than a match based only on the cap or model badge.
Compare the filler assembly with the bottle
Match the tank shape, filler opening and assembly, hose connection and mounting tabs. Use complete views to understand how the separate neck relates to the bottle; do not interpret a detached-parts photograph as a different tank by itself.
The image does not provide an unlisted capacity, cap-pressure value or installation method. Ask for the missing detail if it is needed for confirmation rather than estimating it from the photograph.
Read the remaining exclusions
The selected supply includes the bottle, filler neck and cap. A level sensor, hoses, coolant and mounting hardware are not included. Have the workshop identify any other items needed for the diagnosed repair.
A complete filler assembly is a package description, not proof that the bottle is the source of a cooling complaint. Diagnosis should establish which part actually requires replacement.
Provide a clear parts comparison
Send the vehicle and engine details, original reference and accessible photographs of the bottle, filler, hose and mounts. Label the original and proposed unit. Use vehicle-specific service information for fitting and filling requirements.
Prepared from application records and the linked product photographs. The featured workshop scene is an AI-generated editorial illustration. Information reviewed on 3 November 2026.