Outer Limits 4x4 Board

Pulled my engine out a month or so ago and have had it reco-ed. Just about to put it all back together and put it in, in the process of cleaning everything. When I pulled the mounts off I left the spacers on, but pulled them off to clean and paint them. Have now realised that one is slightly thicker than the other.

Anyone know which side which mount spacer goes on?

thanks,

MB

Come out to my place and have a look at my 60 if you want