Brake Rotor, Rear. FITS 1986-1988 XJS with optional Dana differential. The Dana differential can be easily identified, as it has a three-bolt side plate/axle flange & does NOT have a bottom drain plug. (The much more common Salisbury/GKN differential unit, has a five-bolt side plate/axle flange & HAS a drain plug on the bottom of the case. The Salisbury diff uses part number JLM730 rotors). (JLM731)
