Shorty spark plugs?

[Ramcharger90]

Has anyone ever used peanut spark plugs I picked up cheap shorty header and only 1 plug is a problem with my gt40p heads im sure ill spend the money on ceramic boots and ill wrap the headers and wire for extra protection but I need a part number or what the thread size and depth is. Thanks

https://imgur.com/IjzewYo

https://imgur.com/V8tSh91

https://imgur.com/D4xJ2lH

https://imgur.com/y1iUtYq