I’m no authority but I do know that +2’s did not always have matching left right identification badges, from the early days on one side or the other may have an extra badge.
I’m sure that mine (+2s130/5) was not symmetrical - seems like so long since I took the badges off for the respray… I do remember wondering the same myself though, and couldn’t find any holes / glue marks to match on both sides.
My car is an S130. It has just the one badge on the n/s rear wing - “S130”, and nothing on the o/s rear wing at all which I believe is how it should be.
I have the totally non-definitive answer. One of my cars has one badge on the nearside, the other has a badge on both sides. The car with two badges has never been restored, but that doesn’t mean that it hasn’t had an extra badge added It is also one of the last cars, so maybe they had lots of 130/5 badges left
Go with whatever you like best!!
Mark