What is the difference between the sleeves with flange and without the flange? I searched online but couldn't find an answer

 

one has a flange, one doesnt...
get the flanged version. Don't mess around with the non-flanged version.
The flange helps hold it in place, and is mildly stronger. These work well for builds.
non-flanged is really just a cheap option for repairing a damaged cylinder in a stock engine. Don't use these for anything that will see frequent abuse.

 

thanks man