The 40 Gallon RV Water Tank (SKU 3029/W1565) is available for purchase and measures 57" x 29 3/4" x 5 3/4". Currently, Elkhart RV Parts does not offer custom spin-welded tank fabrication or the custom fittings install service, as it is temporarily paused. You can order the tank and the fittings you need separately, allowing you to install them according to your specifications for better flexibility. If you require fittings not listed on the website, the parts department can assist in sourcing specific fittings upon request. The custom fittings install service is expected to return soon, so you are encouraged to check back if you need installation assistance in the near future.