Yes it is different, auto cars have a bush, its really just a support bush, as the torque converter nose does not spin in it unlike a manual gearbox shaft. When the crank turns it also turns the converter as one unit. So I am using some suitable sized tube cut down to fit inside the crank end where a normal spigot bearing would go and also to be a snug fit over the converter nose. On the donor car (auto) I couldn't get the bush out without destroying it. Hopefully I am now sorted, thanks