What size fuel filler hose?

[Okie528]

Hey guys,

I just ordered a new tank for my '72 Blazer (standard 21 gallon Counter part tank Kit) that all the online parts guys sell. I'm replacing a leaking aftermarket 37 Gallon tank that was installed in my truck in 1977, so I assume it will not have factory hoses for me to try to match. Based on the above thread I know I will need 1 3/8" hose (what length) and also if you all could tell me what other hoses I should order to install this tank. Also, the description of the tank says "Does not come with the original Blazer filler neck. Spout may need modifications." what modifications are they talking about? Any advise to make my install go smooth will be appreciated.

Thanks in advance.