I have received my new stainless brackets and I'm happy to agree! The transom mounts are remove and replace, with the holes lining up. The old mounts had countersunk screws, but the new mounts are not countersunk. So, I'm going to see if there is enough clearance between the transom mounts and the brackets to use stainless hex head bolts (hardware was not included).
The new platform bracket holes are the same pattern as the old, but the new bracket is wider so the holes are relocated barely 3/8" from the original. Troy answered my question as to the composition of the plate (aluminum). I may try to capture one side of the original holes with the new bracket, and redrill/tap the other. However, I don't think the geometry from the mount will work.
Troy, how close were you new holes to the old, and did you have any problems?
J