The passenger side tube has perished, so i found a replacement from VW Heri (VW pt no. 321 971 840), now I have come to fit this i notice that the hole in the body and tailgate is round but the new rubber grommet tube is a rounded rectangle

Looking at the the driver's side rubber grommet tube carrying rear heater window wires, the body and tailgate cut-outs are actually rounded rectangles.... so i have the wrong rubber grommet tube. The perished rubber grommet tube i took off looked the same as the other but has circular grommet type ends.
Really surprised that VW has used two different types of rubber grommet tubes. I have looked on the usual parts sites and on here but can only find the one i bought.
Any help on finding the part or a fix would be a great help. I'll also post a wanted.
Thx Pat
Update 1: found the part no. I need, its 251 971 840, initial search not showing availability in states
