Dipshit Fuel Line Question

Don't know the answer but, I have a brand new line for my 70 Duster that if I'm not able to straighten out the tittle, I'll be selling. That and a bunch of other new parts I bought for it like brakes , suspension and other parts.
I think the lines would be the same if the cars are the same wheelbase. I don't know for sure if they are. Is it 3/8 or 5/16?