Replacing Tien's HR's
 

My setup will be strictly street driven on 18" wheel but my car came with Tien type HR's so all other OEM hardware is missing.

If i go with a spring/shock combo such as say koni's and H&R's, what other OEM items would i need to make this work?

Or would it be more feasible in this situation to go with a coilover even though it will most likely be an overkill.

Eddie