DAVES89, all is well, I have recovered my cost (plus a little beer money) and have one set left, sitting on the shelf for when they are no longer available again and someone needs a set.
FYI, on the pair of Riviera 71801's that I bought... I removed the air bladder and upper case, so now I have my set of replacements for whenever the time comes. They are exactly the same as the 71966 once the added air spring items are out of the way. The boots attach perfectly and everything.