Okay, I realize I can go to Biltema and buy the entire wall mount but I probably only need one and it feels unnecessary to buy an item only to throw away 80% of it.
If a round variant is acceptable, there is something called a rundjärnsbygel. All plumbing companies with stock should have some at home.
If you only know the thickness of the pipe, there are three alternatives within your linked product versus the plumbing catalog:
33.7
42.4
48.3
Of course, these variants also fit dimensions a little "in between," choose the one that fits best. Basic prices: 8.20 - 10.20 - 12.80 plus VAT at the wholesaler.