I have a cool head 19cc if you need one. It needs the rubber rings on the top. Sorry I don't have an answer to your question but a solution if it won't work.

 

Can you reply with some measurements of the cool head dome itself. Will need all machined mating surfaces measured.
Neil

 

Will a pro x dome work in a pare head? Any help is much appreciated...

No....the ProX domes and the domes for the CoolHead or Pro Design head are significantly different. They will not interchange, or fit when cross using the two.

Carlos

 

Thanks guys, that's all I needed! Daniel370, I appreciate your generosity but I need a 310 dome so I'm pretty sure the 19cc won't work for me, thanks for the help and quick responses guys!!