if you got H&R Sport springs for the I4, the model # would be 51853 for both 2dr/4dr. It's probably on the box somewhere.

Now that I realize it, you probably got the instruction sheet that applies to ALL 3 of H&R's springs:

OE Sport
Sport
Race

all the mumbo jumbo about 51853-88 & 51858-88 is just a side note for those installing H&R Race springs.