I’d be interested to see the foam thickness Gary compared to your original.
The hump seat I have from Leightons is much thicker than my original seats.
The foam is 2-3/4 inches thick at the rear center, which is the same as an original, at least the best I can measure as the original is real crusty.
The Burton Bike Bits seat I have is about 3-3/4 inches tall and looks fairly good. It has a good even fit on their foam. This Leightons, not so much so. Foam needs to be a little longer front to back and the cover sides need to be a little taller too.