I am running a 81 CJ-5 151, SR4 hydro clutch setup on my Small block. I cannot locate a new slave cylinder for it. I got one from 4wd parts and it is not correct. Mine has a bracket off the side of the cylinder for the mounting holes while most have the bracket holes inline with the push rod.

Any ideas?

my dads 80 cj7 151 sr4 I was able to get it from wagner brake products anywhere they sell wagner produst and it is one like you are talking about
here is one a advance auto parts http://www.partsamerica.com/PartDetails.asp?SourceArea=&SourcePage=SEARCHRESULTS&MfrCode=TRQ&MfrPartNumber=CS11956&PartType=236&PTSet=A