What else do I need to execute an "in tank" fuel pump swap ?

I am a bit confused with respect to "o-rings"
Can I use something found at A-zone, Checker
or are these some sort of special GM gizmos...

Would anybody recall either the correct dimensions
and composition or the correct part numbers ?

Thanx for the assist

 

The o-rings you need should come with the new pump.

 

Thanx 57...
The big oring was included with the kit...
I was wondering about the little ones in the fuel line...


Also...
The new "walbro" doesn't mate up with the stock
power connector. It seems to "want" some spade lugs...
(not included with my pump)

Anyone have any trouble with your garden variety
spade lugs in this application....

I have never checked out the insulated lugs in terms
of fuel resistance....

Should I be using something special here ?