Ben300tdi

Looking for a bit of help. Recently purchased a milemarker hydraulic winch. Looking to make the speed control and free spool all pneumaticlly operated. I have watched the video on you tube and found the original thread on here but I wanted some help in which size Rams are required and where I can get these from. Any help would be much appreciated. The winch I have is the same as in the video. Many thanks Ben https://m.youtube.com/watch?v=F2yhmmQHBos&feature=youtu.be