Source for Omega Air Charger burst discs?

I thought this would be a simple thing... NOT! When I bought my compressor a couple of years ago, it was used and I never got the baggie of spare bits. I just fired it up after sitting for over a year and I noticed a hiss as it reached about 4K psi pressure and struggled to get to 300 bar. Once it kicked off, the hiss was still there and I quickly found that the burst disc unit was leaking. It wasn't a complete failure, but the leak is definitely there. I figured that I would go online and order up some spare burst discs and life would be good. That hasn't happened. I don't want to purchase some mystery component from China. Does anyone have a reputable source for replacement discs? I am guessing that I would want ones designed to fail at 5K psi. I have a call into AOA, but no reply from them yet. Thanks in advance for any help.

Mark