Rack and Pinion Leaking need to identify the replacement seal needed

Mercedes Benz, ML350, 2003;  Seal PIC around rack & pinion line connection, fastened by a cap with a E-Torx head nut, see PIC.  Can anyone provide me with the part number or even nomenclature of the seal that seats the E-Trox headed cap?  This is where my rack and pinion is leaking.  There are a lot of rack & pinion seal kits out there but I don’t know which one has the seal I need.