Just found this. I know it’s in Oz and it’s not cheap but I cannot see this being made as a one off unless you’ve got the workshop to do it for less. Nice looking item too. https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/352573423223 They are available for the 24 valve too here. https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/352514370020 These will be below the import duty threshold but will attract UK VAT of around £18 on the £92.41 sale and Delivery. Plus £12 admin from the P.O. £132.41 approx total.