Titanium nuts for your ski. Feel the bling. The nuts come as a single unit with a titanium washer as well. Sold as single units 

M8 thread with a 13mm head 

If you have a 800/750/650 you will need 14 of these

The 550 needs 15 and the early model 400 and 440 had 17 bolts so you will need 17  of these, Lucky you.