Hard to find 5 Vintage 1976 Kluson Sealfast Ferrules, I am clearing some of my spare parts and unfortunately only have 5 of these and not a complete set. I have seen this style on a 1976 Gibson Johnny Smith. The inside diameter is 5/16" and the outside diameter of the flange is 5/8". Measuring with dial calipers the outside diameter of the knurled end is .390. The gold plating is nice but there are nicks from being used and being stored in a parts drawer with other parts for years. Thank you