New mounts measure 17mm, when they hit 13mm they are considered bad. You have to measure from one of the rubber rims up to the supporting arm. Is diff to describe but will prob make sense when you are under the car. Use something like a 10mm socket whose OD is 13mm as a feeler gauge.

Left and right mounts are usually made by two diff suppliers. IIRC one is Febi and the other Cortec or Corton? They each have diff rubber durometers.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)