Specialized rockhopper 1998 A1

[Josh B 15]

I have a 1998 Specialized Rock Hopper A1.
I've read conflicting information.
Does anyone know the seat post clamp size. I think 30.4 but please if someone knows for sure that would be greatly appreciated.
Also if anyone knows the stem cap size that would be good too.
I live in the UK so don't know if that makes a difference

 

[Peughop]

I think it is 30.9. I have the same frame and im building it up as a gravel bike.