Hi there, I have a brand new ARB locking diff to suit your Defender. I got it with my 90 when I purchased it and had full intentions of fitting until a recent shot in a V8 Tomcat. I am now about to advertise my 90 and treat myself to a Tomcat so the diff is spare. I am told they are super strong and well worth fitting even if you don't connect up the locker. Is brand new, still boxed and for sale at £350. Cheers.