Proper caseback gasket for 145.009 Chronostop Geneve

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I ended up buying a different Chronostop 145.009 than the one I asked about recently here. The gasket fell apart when I opened the case and now I’m not quite sure how to replace it. The gasket that came out of the watch is 0.8mm in width and 0.6mm high, even though the groove in the caseback is 1.5mm deep.

I put a 0.7mm generic gasket in there for now, the closest I could get my hands on. Does anyone know what the proper gasket size is for this model and where I might find one? My cursory search turned up a lot of thicker gaskets that are too big in diameter for the watch. Is 0.7mm close enough for government work?

Sorry for the lousy dial photo.
 
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088NS0014 | FLAT SEAL D28.8 D30.1 TH0.6