Coolant Tanks?

[Grizzly]

Is anyone clued up on The Revolution type coolant tanks? I am after one i don\'t need to use an AST with but all the ones I’m coming across are the unsprug cap type? I have the Second gen Neck in at the mo but come to the conclusion i really need an AST but want the space as well (if that makes sence)

https://www.rhdjapan.com/revoultion-...fd3s-13b-14459

Just seems a shame to buy a Revolution Tank then cut the top off it....

This is what i\'m after but can\'t find anywhere that sells them, i have e-mailed ReA but not replied yet.