I have also searched the old archives but to no success. I have pulled the rear motor mounts on my 308 to cure an oil leak around the studs that hold the mount to the motor. Lots on this in the archives. Permatex #2 solution. Separately, the vertical bolt that holds the rear mount to the frame has a large (say 3 - 4 mm thick, 50 mm diameter) washer/spacer between the mount and the frame. This washer/spacer has a 25mm, 1 - 1.5 mm deep recess milled out from the center, into which fits a smaller washer/spacer. One of my mounts has the smaller washer, one doesn't. I don't believe they have ever been apart. Looking at the SPC, I notice (i) motor shims are only on the front engeine mounts, not the rears; (ii) the larger spacer is shown; (iii) the smaller is not. This leaves me with two options: (i) "leave it alone if it isn't broken": put it back together as it was. (ii) add in a new spacer to match its partner. Anyone have experience of this? Recommendation?