I Just finished doing the same swap. I ordered new polyurethane body mounts for a CJ. You’ll need to use smaller diameter bolts for the YJ body, but the guys at 4Wheel Drive Hardware said that it would be okay. Make sure you save the sleeves from the old body mounts, mine had rusted completely apart so I had to use some galvanized electrical tubing. Looking back I wish I had gone with the 1" daystar body lift. Have fun.
1979 CJ7 Renegade 304, 3spd, 2.5 BDS lift, Hedman headers.
Check it out 1979 CJ7