If it helps any, H&R color codes all of their springs in the following manner:
1) H&R Race Springs = red
2) H&R Sport Springs = black
3) H&R Super Sport Springs = blue
4) H&R "OE" Springs = gray (or very light blue)
The part #'s for each will vary based on make, model & year of vehicle. You can jump onto H&R's site and look up the vehicle and it should give you a reference of what part # springs are applicable to that vehicle:
http://www.hrsprings.com/H&R color codes their springs based on ride height & spring rate - other than that, part #'s will be specific to whatever vehicle they were intended to be used on.
Are there any other numbers/stampings on the springs in the above picture other than what is shown in the pic you supplied? If there are, have the seller tell you what they are because if I am correct, H&R stamps all of their springs w/ specific part #'s...
I will tell you this - I am running the H&R Race springs (red) on my Cobra and they are a very STIFF spring. You can press down on the vehicle at any corner and there is hardly any "rebound". These are very good springs, however, for daily driving and due to NJ roads (some are good some are laden w/ imperfections) - they are not a comfortable spring even when integrated w/ the Bilsteins and other aftemarket suspension components I am using. For road racing/auto crossing purposes, they surely would be a great spring. I will be swapping them out for a set of H&R Super Sport Springs (blue) which have a lower spring rate for front & rear.