Bought with a Bailey Senator Carolina 2008, but never used, still in original sealed bag. These are from 2008, part number is 1288476, to fit these wheels from the Alko site here http://shop.al-ko.co.uk/products/insert-22--bailey-senator-14-.html
The part number is different, I presume this is because they have made minor changes to it since 2008.
The ALKO Secure wheel lock is the most secure anti-theft device available for any caravan with an ALKO chassis with alloy wheels. The Sold Secure diamond standard wheel lock provides the highest level of protection to ensure that the caravan remains safe and secure on site, at home or in storage.
With over 33,000 security combinations, a 9 pin anti-pick radial lock mechanism and a registered key management system, ALKO Secure is the most effective anti-theft deterrent available for caravans.
Leading insurance companies offer significant discounts where ALKO Secure is fitted, and when combined with other ALKO security devices even greater savings on insurance premiums are available. For example the caravan club insurers offer 10% discount for using this device another 10% for an ALKO hitchlock. Thus in addition to stopping some low-life removing what you have worked hard for, it will also pay for itself in time.