1977 23' CC Fuel tank leaking

[marlin200265]

Well it all started with the wife saying it was okay to buy the boat. Now comes the fun, started out reading everyones rebuilds , how to's and everyone elses experiences. First off LEARNED A TON SO FAR FROM EVERYONE.
Thanks

On to my question - have a 1977 CC 23' with the fuel tank aft leaking. Found this after adding 5 gallons and watched it pour out drain plug after coming back out of house. Tore entire CC off, all three floor panels to find a large hole in tank , about 1/8 diam. Wondering if anyone knows where to buy an alum replacement tank. 38" x 28" x 13 1/2 tall.

I am contimplating tig welding the small hole, but the tank looks to be original and I am not sure fixing the hole
(corrosion on tank) will not be the end to my story of I weld and put back in.

1977 23' CC with Merc 5.7l and bravo 1 outdrive. (boat was repowered by last owner)