Please PM your number for more info...I just bought a Spectra and need to measure,but these look similar,I will have to get to my G/F's house,where I keep my boat, to measure but I am interested if they will fit! If you still have them....also,any sending unit's (fuel gauge) or no? Doesnt matter..just curious...   Tracy   aka "Skee"  Also...are you sure that they are 21.8 gallons each? that seems like alot...how big was your Tahiti?

The way I figured the capicity is, If you set the tanks together so they make a square/retangle the total size/measurement of both tanks together, would be 15x14x48=10080 cubic inches. Devide that by half ( two tanks), =5040 cubic inches, There is 1728 cubic inches in a cubic foot, 5040 devided 1728=2.916 this the capicity in cubic feet, there is 7.48 gallons in a cubic foot, 7.48 (gallons per cubic foot) x 2.916 (the capicity of the tank in cubic feet)=21.816 gallons.
 These measurnents are from the out side of the tank. The thickness of the aluminum, the radius of the bend, have not been taken in to account.
 These are big tanks. I would love to run them, but they won't fit in the Liberty.
 Both tanks have a sending unit, no guage.