Original factory fitted electric SU Fuel Pumps; the standard pumps are now dual polarity, as long as you get the correct pump for your car it will fit straight on without a worry of who has done what to the polarity in the past.
SU now also supply solid state electronic pumps which look identical but none of the usual problems you get when the car has been in the garage for the winter, they also do not give that annoying tic-tic which makes you think something is about to go wrong, but these electronic pumps are polarity sensitive, you will need to know what polarity your car is as cars pre-1967 may have been changed, they were Positive Earth (EP) or Negative Earth (EN).
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