316 Stainless Steel. M6x16 CSK Torx Anti-Tamper. I got them from the UK. I have a couple spare. I'll get them in the post for you


You'll need the Counter Sunk Washers too. I got my CSK Washers from Pro-Bolt Australia (316 SS/M6 X 19mm OD-
I'll check this size). These guys are the best and the quality of their products is outstanding.
Pro-Bolt Australia
Website: www.probolt-australia.com
Phone No. 0397925025 ask for Tristan
Cheers
T.