97 Subi Legacy

hello gentlemen, if any one knows... im trying to lift my 97 legacy a good bit, like maybe 6". right now its clearing just over 6" im using it to carry usps xD right hand drive and all. rural, so theres some bumpy roads. ive done my good bit of research and know 98-08 foresters are my bread and butter. i bought some 03-08 forester coil overs but they are like 4" shorter than my (maybe stock) air struts. (im very ignorant with suspension terms and overall car stuff so idk what i mean by air strut i just know its not a coil over lmao) im wondering if coil overs in general are shorter than air struts? please enlighten me subi Gods thanks!!