backer plates for transom U-bolts

[love2fish]

What are you all using for backer plates for the transom U-bolts?

[Capt. Bob]

How about this?
I believe they are about 2" x 2" aluminum squares (they're probably a little smaller). Don't remember the thickness. You can see the original backing plate down by the hose.
Please remember, that it has been 12 years since I installed those plates.