Yes. they should be able to help you make that 39-47 tank fit. a little back ground here, i have the registry/forum for the 39-47 series Dodge trucks and went to Tanks, Inc some years ago to task them to consider building a tank that was not available anywhere at the time. i sent them a used one, leaker, but good original shape and they duplicated it, sent me a prototype and after a few changes suggested, which they incorporated, the tank went into production. They ordered a container load from Taiwan, and it has become a best seller. - also duplicates as a universal fit tank then last year, they called and asked again about how it could be made to fit the B series trucks. i had previously fitted it in a 49 truck and provide notes that a bracket would have to be made, and the filler neck hole had to be enlarged to make it work. Apparently, there is enough interest in this so they have now provided the above mentioned instructions to modify and mount it. So, yes, i would NOT hesitate to buy one of these 39-47 tanks from them (or DCM Classics) and perform the fabrications to get you a nice tank for your B Series. As for spring bolts, check your local auto parts store, in the bubble packs for accessories, look for some modern intake manifold bolts/springs - i found some that are almost a match for the originals on our trucks.