I have at home a 3.77 MK2 diff centre and RS2000 bumper ends. Not sure on the value nowadays but I have had them in the shed for about 10 years since I sold my RS2000 (which I now deeply regret).
 
If there is any interest let me know and I will post up some pictures. 
 
The diff is spare because I installed a 4.44 ratio at the time. I have the RS2000 bumper ends because I intended to buy a 2 door (which hasn't happened) and I love the RS rear bumper compared to the stock one. 
 
Cheers.