Projects 48 chevy 3/4 ton fuel tank?

Am I blind? Or is there really no repop fuel tanks for a 48 chev 3600, original under bed mount??? Mine is rotted out.
If there isn't any available, what have you used in its place? Leaving the truck a flat bed so I don't want a goofy tank sitting on it, need it to be in stock location. Not interested in putting one behind the seat either. Hoping someone has had this problem and has it all figured out haha.
Thanks

 

https://www.ecklers.com/1947-1948-c...Bw6JOvBmQ4jUUn-vQOBoCgSIQAvD_BwE&gclsrc=aw.ds https://www.cl***icindustries.com/p...uDoKOYEuEK1CDqHLp0hoCs3MQAvD_BwE&gclsrc=aw.ds The second one says 3600 mounts to the frame

 

Rick's Tanks in Texas can build you something to suit if you provide a detailed drawing. Just had them do one for a C10 we're building. Fit perfectly.