need info on tanabe df210 springs

[97240SXSE]

Does anyone know of any reliable source on how much the Tanabe DF210 springs lower the s14? This website: http://trevtec.com/suspension/springs.html qutoes the drop at 1.6front/1.5rear. I found another website that says the drop is 1.8f/1.3r. The reason I ask is that I own some Eibach sportlines and wouldn't mind closing my wheel gap a little more. Sportlines are unanimously advertised at 1.7f/1.4 rear.

Or if anyone knows of some high quality springs that lower the car more than this, I'd really appreciate the info. Thanks.