I found this on the web while trying to understand the different insert sizes and thought I would share. If it already been posted then its a reminder lol.
Old Sub
315-5513 5513 5512 1665 1680 9401
Outside Diameter: 36.55mm
Inside Diameter: 30.3mm
New Sub
315-16808-81 16808 / 16618
Outside Diameter: 37.65mm
Inside Diameter: 30.7mm
New Style Sub no date
14060
Outside Diameter: 36.55mm
Inside Diameter: 29.7mm
New Sea Dweller
16660
Outside Diameter: 36.65
Inside Diameter: 29.70mm
Old Sub
315-5513 5513 5512 1665 1680 9401
Outside Diameter: 36.55mm
Inside Diameter: 30.3mm
New Sub
315-16808-81 16808 / 16618
Outside Diameter: 37.65mm
Inside Diameter: 30.7mm
New Style Sub no date
14060
Outside Diameter: 36.55mm
Inside Diameter: 29.7mm
New Sea Dweller
16660
Outside Diameter: 36.65
Inside Diameter: 29.70mm