These are a set of 6 Stainless Laverda Exhaust pipe studs, 7mm thread each end. Part number 31138502. These will fit any 3 cylinder model, the nuts and washers are sometimes also listed on ebay.
These will fit all Laverda triples but not the 750 twins.
Delivery to Portugal, Greece, Turkey and Spain is unreliable and cannot
be guaranteed, if you order from these countries you do so at your own
risk. It is not uncommon for delivery to take 30 days or more.