All 4 can just be replaced with inserts and then the oil is just for heat transfer. ATF is def good for that task. Idk about all datsun but I know for the Z a nice balance can be had for using poly in some and rubber for others. As mike is saying for the TC rods you need to use rubber, but for things like sway bars I prefer poly. For the suspension hats, rubber, but for the diff mustache bar poly. With a stock driveline its best to keep rubber on the engine, trans and dif mounts because poly makes the whole car shake like crazy but with a build or more modern driveline poly can be used. Blah