澳大利亚采购需求：铝，铝管，铝挤压管

I'm looking to source some aluminium extrusions with specific dimensions and would like to know if you have them available. The sizes I'm interested in include several outer diameters and wall thicknesses. If you have any of these dimensions in stock or can produce them, please let me know. Additionally, I'd appreciate information regarding pricing, lead times, and any minimum order quantities you may have. It's important for us to ensure the materials meet our specifications, so if possible, please provide details on your production capabilities and any relevant certifications. Looking forward to your prompt response!