Good quality new manufacture rear leaf springs?

Can anyone suggest a manufacturer of good quality rear leaf springs (or one to avoid)? The vehicle is a Series 3 Diesel SWB.

I fitted a set of used modern manufacture rear springs when I rebuilt it. However these are obviously weaker than they should be and the back of the vehicle has always sat too low.

Do new old stock originals exist anywhere? If they do I would think they would be expensive.

gb springs but I think they only do parabolic, could try dunsfold only ones I can think of that might have nos originals

Thanks for the replies.

I bought the rear springs I have now for £50 from ebay back in 2012. They came from someone who claimed to be getting rid of them as they had fitted parabolics. Now I can see that they must have got rid of them as they are low quality. I have never yet got round to doing anything about them as I do so few miles.

gbsprings picture ordinary looking springs on their site although they are labelled parabolic. Worth a call to them?

Jones springs have a decent reputation. Avoid Britpart - read at least 3 horror stories where they don't fit correctly.

Thanks for the replies. Something else to add to the never ending list of jobs.