I think there is a fair amount of confusion because what you are asking about is very unusual. I have been sailing a long time and have never heard of such a thing outside of Europe. So, it isn't surprising people are confused about what you're asking.
That said, I think the next point of confusion is why you don't get the actual dimensions from the current bridle. There is probably no one better positioned to get the best dimensions for your boat than you are. Since these lifting points are surely aftermarket additions, there would be no "standard" placement or dimensions.
That said, I think the next point of confusion is why you don't get the actual dimensions from the current bridle. There is probably no one better positioned to get the best dimensions for your boat than you are. Since these lifting points are surely aftermarket additions, there would be no "standard" placement or dimensions.