Hi Jeffery. Here is a link to site catalogue.
http://www.speedflow.com.au/SFPCAT.pdf.
Ive ordered two of these ( one only needed) 990-06-D -6 weld on orb. For my outlet and fitted up the tap direct to the tank body. Page 32
and two of these ( again one only needed) 999-06-D -6 weld on male. I usually weld this on the top side of my filler neck just under the cap to connect my vent line to. Page 32.
However your tank has a different way to deal with a rollover vent valve so this item might not be required but will be in the package I send you.
Lastly I ve ordered one of these. 460-32 Aluminium filler neck and cap. Page 33.
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I hope thats a help Jeff.