Burst Disk – where to purchase?

I blew out the burst disk on my selph blodnob valve today. I ordered a burst disk from JDS but I don’t think it provides the necessary clearance so I’m looking for a solution.

Best I can tell it is a 9mm burst disk with Torx head. It sits flush with the valve just like the airforce valves.

Suggestions welcome, links to products are priceless. 😀

Ben