That's odd...just looked at the picture...my S13 reg doesn't have that long outlet with the bend. Is that a S13 SOHC KA reg? Or an SR reg?
The O-ring...you don't have to replace it, necessarily. If you can't get an O-ring that you are sure can withstand fuel and 3 bar of pressure, then just reuse that one. It'll probably be fine.
Dennis
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