H&R Shock? Do you mean the H&R Cup Kit?

Did you get shocks, or springs? Or are they both together?

You need to be more specific.

51853-88 is the model number for the H&R RACE SPRINGS FOR 4 DOOR I4.

51858-88 is the model number for the H&R RACE SPRINGS FOR 4 DOOR V6.

H&R Race springs are different for 4drs/2drs, unlike H&R Sports, which are the same for 4drs/2drs.

http://www.hrsprings.com/site/frameapplications.html