Ed is correct...
at least on my 75 H30. Model 2010 is the strut. Note that dimension A is the outside dimension of the cylinder while the inside ( as noted by Ed in his first post ) is 1.25 inches. However, the length of the cylinder is 3" ( 3" cutlass bearing for a 1" shaft is the next tough thing to find. )
I plan on going to my boat this weekend and will measure the V angle then, but ~60* should correct.
So Larry, have you found a source?