A Selmer Console clarinet is from Selmer UK. And I don't think they are made anymore. I don't think Selmer UK is around either??
From my info, Most of the Consoles were made by Malerne.
Getting individual parts though may be a hassle as it might be easier to buy a clarinet on eBay for spare parts. At that point you're getting another clarinet.
Other than that go to your local repair shop and see if there are spare keys there that would fit. there may be slight modifications needed.