the ignition slot on triples is not Lucas, and on twins isn't it Bosch?
but listen chaps......
we are all getting this wrong, what is sought here is a key for a fuel tank cap, I misread that and thought it was an ignition key, they are both very different, and the seat lock key is different again, so we have run away at a tangent and were about to get it wrong, Motalia has the keys because they were also used on Suzuki's, but they are for the ignition switch, I have looked and I only have one fuel cap key, I might even have the cap that it fits, but cant recall, I removed it years ago, and fitted a non locking type, because I found it a total PIA. In India it is common on Enfields (mostly) to have key operated locking fuel taps for obvious reasons, but that doesn't stop tea leaves removing the entire fuel tank and taking it with them!
Laverda's are notoriously easy to steal, get started and ride away on, especially 180's, never mind 20 quids worth of fuel!, the steering lock is a big help, but again can be easily broken just by sitting on the bike and straightening the bars with your foot, I have done it twice, once on TOG, when I left it overnight and Taxied home, returning the following day without keys, and I am not posting the method of enabling the electrics here, but that is extremely simple, and another on a 1200 that I bought as a parts bike and the key had been lost decades earlier, both time twas easy.heavy chains to lock the thing to something solid is a must.