I have/had a number of those wooden case`s for 5". As said they arent always exact as advertised, but you are only talking about 1/4" down from 6"s. Remember, they were made in both 6 1/2" and 6" a little later. If many are a 1/8 th" off, whats another 1/8th? Probley not that big of a deal.