Hi guys, as part of my engine rebuild, I've been trying to clean and service my EGR valve, however I've hit a road block. For some reason, there is a gasket within the bypass valve which doesn't seem to have a part number and therefore (it appears) is not available to purchase. I have been able to order pretty much all the other gaskets (metal and rubber) but for some reason, this particular one is just not being sold and doesn't not even show on the LR diagram ( I highlighted in red the particular area of the bypass valve where the gasket sits). I wonder if anyone has done this and had the same problem and how they resolved it? A new bypass valve is £500 and I don't feel like putting the used metal gasket back in is a good idea. Any ideas would be appreciated!

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find company which fabricate cylinder head gaskets. should handle that. or cut it from graphite gasket material.

It won't help you but the gasket isn't available because the EGR valve isn't a serviceable item - i.e. it's not meant to be split.
As above, try sourcing some graphite gasket sheet and cutting your own or re-coat the existing one, I've used tyre bead sealant before, if the surfaces are machined pretty well and not pitted, you could use anaerobic transmission sealant along with the old gasket.