For the RV9, the weight for all the flanges, receptacles, and fasteners is 2.626 lbs for the complete RV679J kit. That works out to be .0505 lbs per set including the flange (52 sets). For the firewall, the weight is 1.616 (32 sets). I don't have the weight for the hinge, but let's assume, for the complete kit, you are adding 1 lb for the Skybolt VLoc (CLoc) system.
I hope you can work around the additional one pound as I know you will not regret using the Skybolt VLoc flange fastening system.