So when my nephews knocked the LB1 of my bridge and the buffers were damaged, I took the opportunity to drawn and print multi-height couplings to replace those supplied. They have a little tab to fit into the buffer beam slot.
Multi height couplings for HGLW LB1 by mrsimonwood is licensed under the Creative Commons - Attribution - Non-Commercial - Share Alike license.


Technically these aren't 'web-found' as it was me that put them up! But this seems like the appropriate place to put them. I'd be happy to add them to the files section of this board but I'm not sure there'd be any benefit - duplicate work for me, and using up the precious resources of the forum...