as a suggestion ONLY I ended up at 10Nm that was on a rubber gasket, I'm not sure what you'd use on the metal one if you don't get any info with the kit you could try M&D @ "Iniezione24" for a figure, I used stainless bolts longer than required with an allen socket button head fitted with a spring washer /plain washer then a nut, screwed in to the bottom of the hole then tightened the nuts (whilst holding bolt still with allen key) progressively and finally torqued up (paranoid about stripping the ally') hope this helps