Removal is straight forward, i just punch an awl into it and pry it out,.
Install is tricky, last one i did i hunted for a piece of pipe the right diameter and used it as a driver, with a piece of 2x4 across it,.
Much easier with the timing cover off,.but you need to grind the sides where the pan gasket fits, so it'll slip back into place,.or do it the long way, drop the pan first,.
FYI....,if the front seal is leaking, gravity takes the oil downwards and the wind from the rad blows it all back along the pan,.
IF you have oil dripping downwards onto your balancer, simple physics tells you its coming from higher than the balancer,.
wash everything off clean, let it dry,.throw a handful of flour over and in and around everything, drive it for a day, it,ll help pin point the leak,.
Nick