I pulled my distributor last weekend and checked out the gasket, I couldn't find the exact gasket with the silicone bead on it but did find that a Napa # thm-1064-at thermostats gasket matches up with what I used, the ID is perfect fit for the SD distributor sleeve and then you can trim the OD to your distributor housing or I trimmed mine to the the outer machined surface on the block, that gasket is from a 2.0 and 2.3 Ford 4cyl motor from the late 80's. I hope that helps you out?.
Tom
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