Check your local auto parts store, or motorcycle repair shop. 2-stroke tuners often have a wide range of thicknesses of compressed fiber gasket material at their disposal. Fine port tuning/timing of 2-strokes often involves changing the relative height of the cylinder/s by changing the thickness of the cylinder base gasket. This almost always involves custom, hand cut gaskets.
Auto zone and similar stores generally have at least some gasket material on hand for cutting your own. I would go with a compressed fiber material over cork or rubberized cork. cork compresses too much and can shrink over time and humidity changes. Although, i would probably put my emphasis on finding a thickness as close as possible to what was used originally more than specific material.
I'd just hold the end of the shop-vac hose nearby while i picked and scraped the old gaskets away.
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