Help with dimensions for an adjustable stem riser

[tlippy]

I measure my 700 handlebars at 30.47mm and the stem at 30.5. Don't see any risers on Amazon that works with these dimensions. Is there any tolerance? Anyone bought one that can give me a tip?

 

[tlippy]

I measure my 700 handlebars at 30.47mm and the stem at 30.5. Don't see any risers on Amazon that works with these dimensions. Is there any tolerance? Anyone bought one that can give me a tip?

Also it appears that there are 2 choices. One is to just replace the riser that holds the handlebars. This doesn't allow full adjustment. A max of 60 degrees. The second choice is to replace the entire stem. This allows a full 180 degrees