My 1987 Accord LXi 5speed is dumping oil from behind the crank pulley. What type of seals are in there and are they hard to replace?

 

If it is behind the crank pulley, it is most likely the crank seal, sometimes referred to as the front main seal.

Also think about replacing the tube going from the oil pan to the black box and the seal on the oil filter neck. Unlike later Hondas where the oil filter neck is part of the block, the A20's are a seperate piece. These two are the most prone to oil leaking if they have never been changed.