Protronix module gap question

65 Mustang 289 I am replacing the distributor vac advance. My distributor has the protronix electronic module in it which must be removed first. I no longer have the clear plastic "feeler gauge" that comes with the Protronix when new to set the gap. Does anyone know what the correct thickness is so i can use a regular feeler gauge to put it all back together.
Any input is greatly appreciated
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