Oil Sump replacement?

[BrianB]

Morning guys, I have a problem which I need some help with please. 

Just been told that my previous garage (I assume) must have overtightened the sump plug as it now leaks. Told that I'm best to get a new sump, but.....  for the life of me, I cannot seem to source one. Made worse in that Vauxhall can no longer supply one. 

Where can I get the correct version? - aluminium

- no oil sensor

 

I cannot find one listed anywhere. 

Edited June 14, 2021 by BrianB