PoOnHand will send your inquiry to all specialized distributors.
Thermal Interface Products Thermalfilm for Case 90, Case 199, 17.45x14.27mm, 3.18mm Hole Diameter
Descriptions of Aavid Thermalloy 43-77-2G provided by its distributors.
Thermalfilm low cost polymide plastic insulating film
Avnet
Thermalfilm Polyimide Plastic Films
Verical