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Is there a different hole pattern for the new winches?
If not:
Cut a round which pad minimum thickness 1"
Fabricate a 1/4" round disc for a new backing plate. Copy the hole pattern
Bed the new backing plate with thickened epoxy

If yes:
Cut a round which pad minimum thickness 1"
Fabricate a 1/4" round disc for a new backing plate. Copy the hole pattern
Fill the old holes with thickened epoxy
rotate new winch to miss old winch attachment holes
Bed the new backing plate with thickened epoxy

You can substitute stainless steel plate for teak.
 

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I am no expert on boat construction or GRP repairs. I tend to agree with Marl... this does look like a structural problem... requiring the work that JeffH describes. I could be wrong but it looks like surface crazing. It certainly doesn't look as if the winch will pull out. As I wrote I would simply add a thick stainless steel backing plate below and may a similar plate on top of the GRP.
 

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Where is evidence of structural failure in the photo of the underside? Yes SS is expensive but would be a great backing plate. We don't know how thick the lay up is in this area either.
On my boat I believe is quite thick...
 
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