Hard to answer. What shape are the old bolts in? Can you move them around or are they secure? If they have been there doing there job for 27 years they could be fine.
If you are set on replacing them. someone on the forum always advocates if it is worth doing it is worth overdoing.
Lots of stress on that portion of the boat.
Make her strong.
Just my 2 cents worth.
If you can't repair it maybe it shouldn't be on the boat