Rubber part: Vibration analysis query

Hi,

Currently I am working on a automobile sensor part. This sensor part (i.e PBT materail) is mounted to vehicle (steel body material) through a rubber part. When I run a Modal Frequency Response Analysis(MFRA) after giving all load & boundary conditions, I noticed that there is no rubber part visible in Hyperview. But I can see the Vehicle body (i.e.steel body) & sensor(i.e PBT materail).

poisons ratio of rubber is 0.49 & UTS is 5MPa (no other info available for rubber other than this).

What property do I need to assign so that rubber can see in Hyper view after (MFRA)?

Regards,

Amlesh