Well I am if i haven't got the right one!
The pre-August 89 Sierra Mk2 dash has the high frequency speakers behind grilles in the lower dash, and has the smaller glove-box, and coin holder.
The later ones have no speakers in the dash, the wider glove box, and drivers side glove box.
The second facelift (> July 91) dash has the re-styled upper half but retains the wide glove-box and drivers side glove box.
Hope this helps.
