A local shop installed this BB back in 2013 before I started doing a lot of stuff myself so I never really looked into it until now because I think I need to replace it because I keep getting a clunking/knocking sound and I don't think it's the freewheel though maybe it's the pedal spindle I dunno.
Anyway, going to try to replace this and see what happens.

is this: https://planetcyclery.com/shimano-bb...xoCxKsQAvD_BwE
(btw this appears to be a pretty hard to find size)

the correct replacement for my current:




Yes I measured the spindle length with calipers, it's 107mm. English threading, right?
Weird how it has a piece that snugs against the outside of the BB shell on the drive side, but sits inside the shell on the non-drive side. Is that normal for these vintage bikes?

Thanks for any help.