Westfalen tow bar…321 651 or 321 546

[Paulnanrod]

The caravelle I've bought has the westfalia tow bar (looks to be factory) but did not come with the swan neck. It has the key, books etc but can’t see a swan neck anywhere, looked round the jack etc

The book in the van says the model is 321 651 but other posts on here are 321 546 - does anyone know if both fit? It will just be for a bike rack, so not towing weight, but want to be sure

Thanks