Ditto that. Do you have ACCESS to the entire hull topsides from inside your 424? The striker plate can simply be screwed to the teak rub rail. Suggest bolts in the rubrail be countersunk about 1/2 way and then plugged so teak rather than hull will split under heavy stress. This is a pretty massive job to attempt after the fact. Are you planning to do it yourself? Lotsa compound curves to deal with.
Suppliers on Long Island...