I found that u-joint of subaru and 240z can be assembled together.
1. Dismantle 240z u-joint by using hydraulic press. Be sure not to lose neelde roller in the bearing cups.
2. Dismantle subaru u-joint as above. This was from 1st gen FWD Imprezza wagon (18 spline). To drive out the cups, some spacers may be located between spider and cup. I put some welding rods.
3. I am not sure it is possible to disassemble without damage the oil seals.
4. Pack grease 240z cups and press them in. punch around cups.
By the way, I ended up using EPS system from Suzuki mini car because there is no room for P/S pump.