Well, I did some measuring of the original rings and some averaging because they get pretty compressed and deformed, and it looks like they are 3/16 dia, 4 1/2" ID, 4 7/8" OD. This is a standard size at MSC Industrial Supply and they have them in Buna N which is the aerospace standard and able to withstand temps to 500 degrees F. The part no. is 75749697 for a pack of five. They have a warehouse just up the road from my ranch in Fernley so I am going to pick them up in the morning and I'll let you know if they are the right ones (but I think they are).
As for getting the cylinder out myself, I followed the recommendations, put a board between the cylider and the case, picked up the water jacket and cylinder (aligned on the head bolts) and drop it on the board. This did "start" the sleeve but once it was flush with the water jacket I couldn't get enough pressure on the rounded lip of the sleeve to drive it out. My machinists put it on there press and pushed it out for nothing. It didn't take much force.
A warning: While I was talking with my machinist he warned me that installing sleeves / O rings you should never use oil. Evidently, the oil trapped between the O rings will swell in operation due to heat and hydraulically compress the bottom of the sleeve and ruin the sleeve and piston. I find this pretty amazing but he says that they have seen it on big diesel truck engines. The proper way is to lubricate the O rings with some kind of soap.
