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You can use glass tubing with wire inside. In those days, asbestos was commonly used; it was white and sort of fluffy in consistency. The terminals were swaged or crimped to avoid the use of solder. Occasionally welding was used.
Since it's a heat lamp and won't get terribly hot, you can use Teflon insulated wire, very easily found in electronics shops.
Of course, if you truly want to restore the unit you have to find out what was used in the first place.
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