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This is the HOBOURN EATON 1000psi pump that fits behind the Dynamo and is driven by a coupler between the two. I have three of these one on the car and two spare.
The Dynamo coupler is the hard part to come across. They are a circular piece of metal with a rubber lining to stop any noise and excessive wear of the metal. SNG have them at £255. https://www.sngbarratt.com/English/#...ring%20pump%60
The 1200psi Saginaw pump that Glyn mentioned sits beside the Distributor on the 420 and is belt driven but there is no room under the S Type/Mk2 bonnet for this pump.
