Sorry Morgan, I have what is going to be a E/H X45 Tourer. Unfortunately I don’t have a ‘car’ as such just a mountain of parts that I was lead to believe was of numerous 1919 Buicks. The two pairs of rear springs I have are 8 and 15 leaves. The 15 leaf pair came off the chassis I bought most recently with a diff etc still mounted under it which I assumed had never been out.