Hi Peetee, I'm afraid the OEM springs ceased to be available from Renault a very long time ago. Elbach were the OEM supplier that provided them to Renault in the first instance.
The front springs were unique to the Trophy due to the Sachs adjustable, however the rears, while colour coded for the Trophy (as I recall correctly) they were 182 Cup Springs. There has been much debate about this over the years. They are NLA too. So you're looking at aftermarket or secondhand anyway.
I agree with Sharky that Mark Fish's springs had/have a great reputation.
I was lucky enough to purchase a spare pair of the front springs when a forum member persuaded Elbach to remanufacture a batch a few years ago.