Are fuel necks interchangeable in square door beds?

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Grit dog

Grit dog

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1986, 1977
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Dave M said:
It was lucky I bought new hoses at the time, I managed to get the new pliable, smaller '76 hose, to stretch over the larger tank connection. I didn't know the size difference when I bought the tanks. The used tanks I got came with the filler necks with the plastic adapter to the body and a screw on cap. So what year are they?
Click to expand...
‘84 and up.
 
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