[Healeys] Captured nut thread size, '59 BN-7

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Hi All,

Could someone be so kind as to advise the thread size on the captured nuts
on the BN-7 firewall?  I think they are all the same, and the same size as
the captured nuts that the bolts/threaded screws holds the insulation on
the driver's side foot well, also?

bob walker
phx, az