if u lower w/ just lowering springs, u will still have the big lower spring perches which r part of the struts. to get more clearance on the suspension side u will need to go to full coilovers.
some pics that might help you compare...
here is the stock front strut w/ progress springs (JETBLACK's car):
here is the front TEIN SS-P coilover on my car:
notice the size difference:
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