87 Euro500HVSEC. 88 Euro 560HVSEC. 89 Euro 560HVSEL
I forgot to mention if you are having pump issues- you can buy a SLS pump repair kit from MercedesSource which includes all the parts you need to repair the pump as long as it has not been run dry and scored the walls. Otherwise they can be sourced pretty reasonably from a wrecker/ebay and then the repair kit fitted to make sure it is all fresh.