Bob,
I don't know the answer to your question, but here's how to find out.
First, measure the diameter of the prop shaft. Second, download the struts, shafting and rudders catalog from marinehardware.com On page 25, you'll find a table that shows the packing size and number of rows of packing for the various sizes.
If you want, you can order the material directly from Marine Hardware, but it is widely available in other marine stores.
Rich