Fitted these filters to my Velocette tank, With a bit if drilling and tapping fitted perfect. If you have a old English Motor Bike these will do the job. I used a 5/16 NF Tap that worked OK.
These screwed right into the petcock to tank adapters on my 67 BSA Shooting Star. The old brass ones wee long gone, I thought I was going to have to fabricate something. These are a godsend!