Well, I've asked them and they said the RAM-B-166-UN7U is made of the same parts, namely these:

RAM-B-224-1U
RAM-HOL-UN7BU
RAM-B-201U

So it is the perfect - even cheaper - part I'm off to buy.

ah, ok
I'll ask Ram. The package otherwise looks like a very good option.

Thanks for your speedy response!

Gents, I've tried to post a new thread but it just seems to have disappeared as soon as I hit submit. I'm now trying to post it here, maybe I'll be luckier. I'm looking to get an arm & cradle, now the recommended two it seems are not strictly compatible: http://www.rammount.com/part/RAM-B-166U h...