Tuning Air Arms s410 O-ring help

Hi All,

My AA S410 has a leak between the L-shaped pressure gauge block and the air tube. The old seals are hard and square on the edges, making it a challenge to figure the size for replacements. There are 3 seals, a large one for the pressure gauge, one between the block and air tank, and one under the pan head bolt that holds the block to the air tube. Any help with the sizes would be appreciated. I've looked at the seal kits available on eBay and Pyramyd, but they don't seem to include the three seals I need from what I can see. 

Thanks,

John

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Arrows show seal locations

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The old seals