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Air filter screw size

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GarandOwner

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I am swapping out the airbox on my Cub (Currently has an L-4 airbox) it looks like the stock Cub airbox uses a different thickness filter.

the maintenance manual calls out a pin (P/N: 24306) but the new airbox looks like it has tinnerman nuts threaded for bolts.

what size bolt is used to install the airmaze filter on the stock J3 Airbox?
 

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