I read that the lower unit from the 1973-1977 85HP and 115HP Johnson/evenrude or 135HP units from 1973-1976 will work is this correct ? and is anyone selling any lower units ? i am located in Canada
Look in the "Top Secret File" at the top of the page, there is a conversion chart there that should tell what will fit your engine.
There is also a list of salvage yards there, maybe one of them can help you out.