I have the same issue in need of a temporary solution, filler neck hose is shot on my 76. Any chance you found that part number?
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Hope this helps
My truck has a one inch hockey puck lift
So yours may need a different hose
But these will be close
We usually go to the same parts store
They offered my teenager a job cause we’ve been in there so much
The first time we made up a guide bending a coat hanger and took it to the store and asked if we could go in the back and find a match
Also did that with the wife’s turbo diesel beetle
Needed a upper hose today , VW said six weeks and $90
Took the old one in and found a hose on the rack for a Saturn that was perfect in the center , just cut some off each end
Disclaimers:
I fully understand that coolant hoses are not designed for gasoline filler hoses
And that the fuel will not be good for them and that they will need to be inspected regularly and replaced every couple of years
I have not found any place that sells hoses for early Stepsides so this is the only option