Dimensions of Starcom Bulkhead Cable Socket

[Colonel Panic]

Need to know the diameter of the lid on the Starcom Bulkhead fitting HSEX-04 / HSEX-05 Helmet Extension Cable. I am having Garauld build me a mounting bracket for these and Powerlet sockets. Starcom emailed me the doc that gives the hole size but I need the lid diameter for spacing. TIA

 

[EODSarge]

Just under an inch- .95" by my calipers.