to take the grille out:
Start by undoing the 3 screws on top of the grille (10mm?). Once you've done that you'll need to take out the indicators. Get a flat headed screwdriver push down and forward and the unit should slide out. do the same on the other side and then pop off the white clips under where the indicator was and then gently pull the grille out.
As for the offset on a vtr I think your looking at 16? Pcd is 4x108 (quoted from haynes modifying)
hope this helps