Depends on the steepness of the mountains you want to climb. Normaly regular straight skins not wider than your ski at mid-sole (88mm for you) will work just fine. The lenght shold approximately match your ski-size. They should not be longer because that will make it impossible to strap them on. And with 174cm skis you will have enough traction.

So these come already cut for specific widths and lengths... And because they are by BD, they mate best with BD skis. I highly suggest just getting a pair of regular skins and cutting them yourself, it is a little intimidating at first, but there are very good tutorials online. RandoSteve does one here: http://www.tetonat.com/2009/01/cutting-climbing-skin-video-tutorial/