Mocal oil sandwich plate center bolt size??

[Nismo]

I'm missing the center bolt from the thermostatic sandwich plate can anyone tell me what size ect or where I can buy one? S15 sr20det obviously

 

[JDM_virgin]

M20x1.5 I know this as Ive just bought a sandwich plate for mine

 

[Nismo]

Sweet cheers!

 

[Soul]

Not to dig up an old thread but various threads on the web suggested I needed a 3/4unf16.

So I got that, and it doesn't fit Why is info conflicting everywhere?