Gustav,
I fitted these 25mm Lower ones to my 650.
No problems at all with them.
Don't forget to lower the front as well. Easily done, no parts needed.
Suzuki DL650 V-Strom 25mm Lowering Kit, Dog Bones, Suspension Links.
EBay item No. 110916691908 £19.
But before you order, send supplier an email & check for fitting to your bike.