Might be of use to someone, quite rare now, was a popular conversion in the 70's

http://www.ebay.co.uk/itm/VW-AIRCOOLED-NIKKI-CARB-AND-MANIFOLD-FOR-BEETLE-BUGGY-BAJA-TRIKE-OR-CAMPERVAN-/141494382855?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item20f1b8f107

I vaguely remember these called Nikki Fish carbs and the fish symbol being used by them before it started being the christian bumper sticker. When those metal fish symbols started to appear I thought they all had Nikki carbs fitted.

Could be wrong, just a useless fact that drifted to the front when I read the post