Update: We have lodged enquiries with the various German authorities, hopefully hear an answer back within 12 months. I did do a bit more digging, turns out he was at Stendal in March 1945, forced east due to the advancing US 12th Army Group. Reviewing the US National Archive maps revealed it was the 9th Army, 102nd Infantry Division that made the final push to the Elbe in this area. Some research on this division indeed shows significant German surrenders in the face of the Russian Army on the other side of the Elbe just east of Stendal; http://www.lonesentry.com/102thrugermany/pg63.html
We are still trying to determine my Opa's unit/Panzer Division using online resources, field maps and deployment records, obviously however the records were not great and it was a frantic period during April-May 1945. He was fortunate enough to be taken by US forces, perhaps some records there, still in German archives, let's see.
Next question; does these unit numbers mean anything to anyone; 8th company in Nuremburg in 1943 and 4th Signal Corp in Stendal in early 1945?