Bought a used Koga Trekking Bike, it had an AXA sl7,standard, but in order to use the lock up chain in addition,
which was not supported as a spare, ..
I had to update to their Defender,due to pin diameter increase, then I added the 1.4M chain.
locks up front wheel and onto something.

Clever stocks abus and axa, but I note Abus offers only a shorter lock-up chain at 1M.