Cafe racers were a 1960s thing to make a bike look more like the racing bike - add clip-ons, (the first road bike I saw for sale here with clip-ons standard was the Ducati 750SS) rear set pegs and probably a two-into-one exhaust were the basic steps.
Polished tank next, and smaller headlight - hotter cams and better carbs .. racing seat .. and you have a cafe racer.
Then you can start playing around with frames - so Norton probably made the best frame - and any Brit engine could be fitted into one ..
So here's a 1965 Bonnie ...

The bars are above the tank .. the footpegs are directly below the end of the tank .. almost in front of the gearbox ...
Here's a Triton (Triumph engine in a Norton featherbed frame ...)

This is like the ultimate cafe racer from that period - the pegs are behind the engine, clipon bars, not a two-into one, but swept-back exhausts .. polished tank ... racing seat .. probably engine mods as well
Partly it was a cheaper way to make your bike look like the racing bikes (though a Triton or Norvin was not cheap) ... and, for some, aesthetically pleasing .. (also louder and sometimes faster ...)
"So if you meet me, have some sympathy, have some courtesy, have some taste ..."
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