Westaflia detachable towbar weather cover wanted...

[RSoloman]

I'm having a few problems trying to source a weather cover or plug to go in the fixing hole for when I remove my factory fitted 313424 Westfalia towbar. The cover is part number 921 628 630 122 and UK stockist Witter do not do this tow bar any more and do not stock this part....any ideas or has anyone got a spare they are willing to sell?? Thanks in advance!! Rich