Last fall I had a lower drive "milkshake" problem (posted 10/05) and discovered that there were no o-ring seals on the oil drain and fill plugs and also noticed that the lower plug had been seriously abused by someone obviously really cranking it hard, so Id like to replace the plugs too. I've been looking through some of the "parts" listings and can't find a specific part number for my motor. Upon looking through the parts numbers I noticed that the particular part number for many of the different models and years seem to be the same for those. So my question is-are they all the same plug and seal? Can I use the plugs and seals that would fit an 1985 60hp for my '70?