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They come in different axle lengths.
There’s a bit of info here on Bayliss Wiley lengths and the equivalent TDC which is another brand. The first being the better of the two.
http://www.classiclightweights.co.uk/bblengths.html
Axle number 15 was made for singlespeed/fixed but depending on chainstay shape/chainline you might need a longer one.
Can’t remember if number 15 is asymmetric or not but some are, but I’ve flipped them a few times to achieve a better chainline.
Is your Klunker bb 68 or 73mm?
Might not work if it’s 73.
I agree current cups are nasty. You’d be better of with an old one.
ElGato
M_V
I’m posting in here as I guess the bikes being discussed might often feature cottered cranks?
I have a rather nice set of cottered cranks, Stronglights I think. Thinking about using them on my klunker mtb but not really sure where to start in getting a bottom bracket for them. Like, how are cottered pin bbs even measured? Looking on eBay quickly it looks like a lot of the spindles on offer are asymmetrical would that be correct?
It looks like I’ll need to buy a spindle and then cups and bearings separately, are there decent quality bottom brackets available? Might be best to buy an vintage B.B. and replace the bearings and stuff I guess as new cups on eBay look pretty cheap n nasty.