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I looked into this a little more, and the original MB "interface" from the body of the EZL to the body of the car is a thin sandwich of the following, starting at the body of the EZL:
1. a thin epoxy or plasticisized paint on the bottom of the EZL. I SUSPECT, but do not know for certain, that this part is electrically "HOT" - power output transistors of that era usually were. Do not remove or nick any of this, unlike this writer did! The paint probably provides some insulation (but not all of it, see below).
2. Conventional zinc oxide based heatsink compound
3. The "foil" described in the manual is probably Kapton - a thin plastic, very tough and abrasion-resistant, with good electrical insulation and thermal conductivity properties. This is probably a backup to the paint described above.
It would be VERY BAD to reinstall an EZL without heat sink compound or proper electrical insulation.
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