Siemens Part Number(s)
From the amazon site where the picture came from, we get a part number of B01BORY2F6, which does not make sense from Siemens datasheet.

No plug or flange, so by a process of elimination, we get eight possibilities:





g = Casing length - majority left - 50mm - 5cm.

l = Cable length - variable

m = Stripped length - variable

So stripped length appears to be less than casing length, so 70mm can be excluded (in green).  6 left.

It has a ferrule, so the version without ferrule can be left off (in purple).  5 left.

Assuming 4cm stripped length or 5cm casing, rough length is 30cm.

From amazon site: Product Dimensions    50 x 1.5 x 1.5 cm

Dimensions: 5cm casing + 35cm length + 4cm stripped = 44cm

So actual Siemens part number should be: QRB1B-A035B40A with 5 cm casing  

Alternative: QRB1B-B035B40A with 6.5 cm casing.

You should be able to figure it out from your actual dimensions from this.