英国采购需求：PVC篷布、篷布和帆布设备

I'm looking for a custom cover for a tubular marquee with specific dimensions. The size I need is 420cm x 630cm, and I would like the cover to be reinforced in the center along its length for added durability. Additionally, please include grommets every 45cm along the edges to facilitate secure attachment. For the fixing mechanism, I require a stitched-in flap that measures 20cm along the long sides and 25cm on the short sides. This will help ensure a tight fit and easy installation. If it would help you to provide a more accurate quote, I can send over a drawing to clarify the design requirements. Thank you!