Your 696 coffin master is probably a 16 mm, but those 16 mm can not be directly compared to RCS or other radial masters dimensions. I had a 16 mm coffin on my Monster S2R 800 and changed to a SF master - happy happy happy - although the upgraded master made the smallest improvement to my system - full floating discs and sintered pads made a greater impression on me. I'm saying that maybe the money is better spent on a track day, better tires, suspension tune, ....
YoYoDyne (recommended!!!) can tell you what to do and what parts you need (new brake lines, banjos, tubes, reservoir, mirror bracket, ... )
Thanks for info. but I'm not sure how a track day or suspension tune would help me figure out what RCS master would be the best choice for the 696 ? As of now the 696 has 848 forks with race tech springs & revalved by Catalyst Reaction awesome forks for the 696, stock rear shock which suprisingly works quite well with the superbike forks so no need to change that. I also added aprx. 13mm of rear ride height and increased the trail to 100mm, those changes make the 696 handle like a well set up race bike but still plush enough for street use. I've set up more then few race bikes and am very impressed at how well the 696 handles. I'm running Galfer rotors (which took 2lbs of weight off the wheel fantastic improvement) & Galfer sinterd pads. I have the bike weight down to about 380lbs with a full tank and the brakes are pretty damm good as is. But I hate the looks of the stock master and thats the main rreason for the upgrade & I think the RCS will have a more progressive feel then then the stock one. Is the SF master a 19 x 18 or is it something different ? My worry is that a 19 x 18 may have too much power for the 696 ? The 696 will never see a race track so the master cyl. up-grade is just some added bling hopefully with the up side of improving the brake system.