None are OEM adjustable, unless you have KONI's or other type of aftermarket option installed on the NEW car purchase? Like stated before these are tie-downs that make the rides appear lowered on the transit vehicles. You must secure them to the trucks or they will fall off and you must employ more than 1 device to secure them. Tie downs, & chains, straps, on and on. If you do get a suspension get a combo with shortened struts or check the sr20 forums for '98sr20ve' he can manufacture your OEM struts to make them shortened. Don't ask how he does it, however this will be ideal with lowered springs.
http://www.sr20forum.com/ BTW Auto ZOne, Pep-Boys, & others sell shackle kits that allow you to slightly compress your springs giving you that lowered look. Though like another valued brother stated earlier in this thread you'll only suceed in damaging your struts over time.