correction, some of the universal type have sliders, but you're still just bolting it into the floor pan, which doesn't have all that much structural strength. Its not meant to anchor a seat during an impact.
2008 Versa S:
-Strut brace+Sway bar
-H&R Sport Springs
-Navi HU, Pioneer Spkrs, 2x10" CV Subs.
Make it Handle, Make it Brake, Make it Fast
The Versa Vlog!