Rear Heater Unit-Sub assembly/Packing (1 Viewer)

[Toyota newbie]

I have been trying to find the replacement foam packing between the body and the rear heater sub-assembly. See attached picture. Have been doing the sound deadening. Likely can make something work, but if some one else might know?

Thanks,

 

[NeverFinis]

I wasn't able to locate anything and I ended up using closed cell foam.