Filler neck problem

[84k20]

So I decided 2 years ago when I got my truck I would replace the leaky 16 gal tank with a new 20 gal (drivers side tank) since my truck is a 84 k20 long bed and they came that way factory....long story short I can't find a complete filler neck assembly for this tank and had to make a horrible make shift custom filler neck for the time being and I'd like to get it back to normal.
Anyone know where I can find one? The LMC catalogue shows what I need but I believe it would only fit the 16 gal tank not the 20 someone please correct me if I'm wrong!

 

[8T6K5]

You looking at this...(#11):

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Looks like as long as you use the DS pn you're good. Only the vent hose is different for SB-LB

 

[84k20]

You looking at this...(#11):

You must be registered for see images

Looks like as long as you use the DS pn you're good. Only the vent hose is different for SB-LB

Haha wow guess I didn't read the entire page thanks man!

 

[8T6K5]

Haha wow guess I didn't read the entire page thanks man!