Is it possible. To replace the brake cylinders without removing the shoes

Yes. Just gotta be creative. Get the line loose, and then there is just two bolts that hold it in. You might have to jockey it around some to actually get it out. Putting the new on in can be fun as well. Gotta squeeze the "pistons" in enough to get it in there, and then get them positioned correctly. It's really not too bad of a job.

Cool thanks upgrading to the bigger bore cylinders and don't want to hassles with taking the shoes off because there brand new