They do, or at least did from new. Double ended SU. From memory it's AUF404 as fitted to Rolls Royce etc.
A good few will have been replaced with high output rally / race pumps but these are usually quite noisy. The usual point of failure on the original was mechanical points. A very good upgrade for these was readily available from the nineties. Although the double ended pumps were quite rare they shared components with single ended pumps used on huge numbers of BL cars.
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