I've traded a couple of emails with Zeke Durica at ensign spars.

the tiller parts are interchangable with ours being drilled for 1" rudder shaft. As a result I'll probably break down and get one...

His ensign chainplates are to use his description, "1"X 1/8" thick X 10" long. They are 5/ 16 hole on the top and 3 3/8"s holes at the bottom up 3/4 inch 2 3/4 and 4 3/4."

I haven't had time to make it to the boatyard to compare to A-231s. aside from ours being drilled for a 3/8" turn buckle how close are these to the original drawings?