To add a little to that - when I converted my '03 Rubi to long arms, I tossed my coils in the scrap pile. Then I did a few more LA conversions on non-Rubi's, and tossed those in the same scrap pile.
Later I went to look for my stock Rubi springs, all the springs in the pile had the same GM tag number. There was no way to tell mine from the others.
So I can surmise not all the Rubi's had different springs.