I got all the bits from TTR. They do different springs depending on use e.g. race, fast road and normal. Most importantly they supplied the front units ready assembled as you need special tools to do this yourself.
I bought the front and rear kit from TTR. Very easy to adjust the ride and height you want. Just tell Tony or Stuart what you want from the car and they will supply the right parts.
The only ‘complaint’ I had was that the “C” spanner designed for the fronts did not for the rears as the spring seat diameters were different. Grinding a little off the inside soon made it a common fit.
I have TTR’s fast roas suspension setup, both front and rear on my Sprint.
Excellent !
There was a rideheight issue particular to my car, but easily solved by different spring lengths - all easily resolved by TTR.
Tony will give you all the technical help you need to decide the details.
One point though. You need to first decide your rim/tyre setup and then spring lengths can be set to suit, since there may be wheelarch clearance issues to consider ( though likely much less so, on a +2).