Questions about XLC BS-L05

Is this the same product as from "veloplus" https://www.veloplus.ch/shop/ausruestung/anhaenger/shopper-und-einkaufsanhaenger/veloplus-swiss-design-veloshopper-einkaufswagen-33004575.001 ? There would be spare parts

Where can I order the extension because the stem tends to rub the wheel or the mudguard if the bike is small? It is this part ("verlängerung", at 2min15): https://youtu.be/Geb-sdeI5eQ?t=135