I been wanting to replace my stock gauge, I went out and did the measure of the opening and it is 60mm from top of the circle to the flast cut on the bottom. I think it would fit a 52mm gauge, but does the 52mm and 60mm number refered to the size of the face or the actually outer ring of the gauge body case. I am guessing the cover over the face is bigger than 52 or 60, but I don't think I will be using it if I put it in the stock spot. If anyone can do some measurement and post it, it would be great for me to do a mock up and see which one would work best in the stock spot this weekend when I install my new springs, flush my brake and replace my oil 
, if all goes wells I can get it all done on friday :x: .
, if all goes wells I can get it all done on friday :x: .