Right a little update..

.....the lsd diff went straight in and meshed perfectly..they weren,t interchangable because the lsd diff was an 8 bolt fitment...and the xr2 a 6 bolt fit...so that leaves the question what box is the lsd from the i.d tag states
87 WT UA
F0G 8B 04B
ANY HELP would be greatly appprieciated thanks in advance....darren.