O.k. I wrote Terry from UTE, who is very nice and patient.
He said that one should order the following spring bars for the Seiko turtle:
...which of course, I just did!
I still don't understand it too well, and it's not the easiest website,
which is why I emailed him.
The shipping costs even more than the spring bars, but whatever!
I needed to know that the rubber strap is going to fit on perfectly.
It should look great on the Seiko turtle.