Is there alternative Westfalia towbar to 321647?

[captaindarling13]

Hi, I have a 2021 T6.1 Redline camper conversion. It has a Westfalia detachable towbar, model 321647. I am looking to fit a bike rack, specifically an Atera Strada Evo Rv, which would slide out enough to open the barn doors. However this requires 50mm between the top of the ball and the bottom of the doors which mine does not have. An ebay search shows a number of Westfalia towbars where the ball is lower with respect to the top of the insertion post and these all appear to be an A40V type fitting. I have messaged several sellers of these units to be told that none of them will fit a T6.1 because of a so called 'cut out'. My attached image shows a T6 towbar with what I assume to be the cutout. My unit does not have this, and yet none of the sellers will go beyond their 'will not fit' statement.
Has anyone managed to use a unit other than the 321647? If so what did you end up with? I thought the VW tiguan 303189 might achieve my aim, but none of the sellers will measure one for me

Thank you, David.
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[Ayjay]

If you worry about such things, I suspect your other problem might be insurance. When I first started looking at towbars, I asked Westfalia whether it would be possible to switch the detachable bit with another version and they said wouldn’t authorise it as the two parts wouldn’t have been tested together (or words to that effect). That said, I’m not sure how anybody would know in the event of something going wrong….