Die cast aluminum tubes are not commonly available, as aluminum tubes are typically extruded rather than cast. A user suggests exploring companies that specialize in spin casting tubes and inquires about the specific type of tubes needed, such as hydraulic tubing. They mention GT Tubes in Sheffield as a potential source, although they couldn't locate it online. The discussion also highlights the need for a European equivalent to the US-based Thomasnet directory for finding manufacturers. Quick sourcing options are emphasized due to the urgency of the request.