1975 SF20 47 Gal. Fuel Tank

[caper]

Ethanol plus 31 year old tank has caused me to finish out this season with an above deck tank under my console. I would like to order a new aluminum under deck tank to replace the original tank. If anyone has done this in the past I would like to have the dimensions of the factory installed tank so I can order the tank and install it when I pull the boat at the end of October. Sketches, drawings, dimensions, tank fabricators - any and all help accepted. Thanks.