Yes, that one should do it.
To post the end of this A long saga, I contacted several dealers including in Germany and found the best price and shipping rate to North America was Robert White Photographic in the UK.
So for less than the price of that auction, I have new Rollei Bay VI caps coming. Caps are 10 pounds each (+ VAT if you live in Europe) and they are not listed in the web catalogue. Still a bit pricey, but cheaper than a hit to my precious SL66 lenses.
Many thanks.