Thank you all for the replies. I was able to order custom made copies of the gaskets much cheaper than importing a set that might not be right.
https://www.ramgaskets.com/ in Cornwall gave a very reasonable quote in a matching material.
Barrie's suggestion of using copper sounded great, it is difficult to remove the header bolts, so lasting solution makes sense. Lacking the skill and patience to cut copper myself I did try Stephens Gaskets who put me on to Dobsons Gaskets in Keighley. They quoted what I considered to be a reasonable price to produce new gaskets in copper, so I ordered them.
Thanks
Kevin
https://www.ramgaskets.com/ in Cornwall gave a very reasonable quote in a matching material.
Barrie's suggestion of using copper sounded great, it is difficult to remove the header bolts, so lasting solution makes sense. Lacking the skill and patience to cut copper myself I did try Stephens Gaskets who put me on to Dobsons Gaskets in Keighley. They quoted what I considered to be a reasonable price to produce new gaskets in copper, so I ordered them.
Thanks
Kevin