I suspect after 41 years of use this part may be past its best. Obviously an oe Lucus part is not available. I have seen various outlets advertising replacement ones (Rover part number 563417) however these seem to have five terminals and my original relay only has four? Also I would prefer to use a more cost effective modern part, either Bosh or duralite. Despite speaking to a couple of relay suppliers nobody seems to know what I am talking about! Is there anyone on here who would know a correct replacement relay part, maybe even supply a link? Thanks in advance for any help you may be able to give.