Regarding your order #10015944, the tank is currently in production and is estimated to be completed by May 19, 2025. You can track the shipment of the other available items in your order via the provided tracking link. Currently, Elkhart RV Parts does not accommodate custom dimension requests for holding tanks, as all tanks are custom made on demand but within standard sizes. However, the company is working toward in-house manufacturing to support more unique dimension requests in the future. Meanwhile, you are encouraged to explore their extensive selection of RV holding tanks using their Tank Finder tool to find the best fit needs.