Alko wheel lock again

Leading on from my previous post.  After checking the ALKO website, I emailed their customer services department and the response was prompt and very helpful indeed.  Was told that I could buy a new size 31 insert, (lozenge only) and use the "innards" from my existing size 24.  Price of size 31 £109.94 delivered, so if anyone wants a "mint condition" size 24 lozenge, make me an offer.  Can't stress enough how helpful the ALKO people were.