Maybe I'm missing some thing, but why do you need to do anything other than clamp the appropriate hose to the filler neck (using a pre-bent hose if you need to have an angle)? I've done that on cells that had a straight filler neck, and have had no problems.
Somebody may argue that you need to have a raised ring on the end of the filler to prevent the hose coming off, but I don't buy it. The pressures involved are minimal. In fact, one cell I used for many years had a NASCAR filler neck with no ring yet I managed to do fast refills (like 11 gallons in 5 seconds - it was fun to watch the cell expand from the air pressure!) with no problems.
Bottom line - just clamp on a hose and you'll be fine.
Tom Lyttle
Decatur, GA
IT7 Mazda - 2006, 2008 SARRC Champion
ITS Nissan 200SX - finally running correctly
FP Ford Capri - waiting for a comp adjustment
GT3 Dodge Daytona - what was I thinking?
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