A:
There's nothing special to the lids to the meat lugs. They are just your standard lids.
If you are close to a BPS I would suggest bringing your lug along and making sure it fits before purchasing it and having to return it.
A long time ago I did by some lugs from Gordon Food Service (GFS) and they do NOT fit the lids but the newer lugs I got from BPS fit fine.
It's just making sure you have the right size.
RB