Seeing that the CA18DET was a factory option in the S12, I dont see why one would be so worried about the S12 mounts. The things to consider though are: their age, the wear and tear on them, how they seem to hold when testing motors and placement of the CA18DET and how much vibration is felt around the car. S13 mounts are probably better due to age and the fact that the mounts themselves are different and in some ways use different materials.
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