I need to replace the p/s pump in my 300E, and I don't really want to drop the $250 for a new one. I found some online from the 90+ 300E's, but wasn't sure if they will drop into my 87. Are the pumps in the 1987 300E's the same as in the 90+ 300E's? (sorry if I sound like a dumbass, but I searched already and wasn't able to find out).