The replacement OEM 51020032A is 127.95€, thankfully Stein-Dinse offer an alternative 51020032A-Z at around 70€
I have to check back on my e-mails to confirm the part number etc, then get in touch and find out if they are willing to do the deal. Bear in mind that this will probably cost me around £6K landed cost, so I am not going to pull the trigger unless I can make some money on the deal. I have already spec’d a kit including the star washers and pipe clamps necessary to do the job.