I requires a little stretch to fit. This is the size recommended by the PSS technical guy.
Installation is simple and straightforward.
The difficult part may be removing the flange from the prop shaft. This should exert enough pressure to push the sheaf out of the flange. If more persuasion is required the apply some heat to the flange. When reassembling the flange to the shaft use some antisieze compound, it will make thing easier to take apart in the future. The only cautionary note is to be really careful when sliding the fixed stainless steel part OD the seal over the shaft.