Does anyone please know if a clubfoot type silencer is a direct replacement (same brackets on frame and silencer) for the banana type rear silencer on a Bultaco Sherpa Model 124.

I've seen them fitted using the same mount on the rear loop, but if you have the 124 model middle box, the clubfoot inlet may not mate up with the middle box outlet as there are different diameters and outlet shapes to consider.

If you repack a banana silencer and also the middle box, that combination works pretty well and isn't noisy. Look at the Spanish bikes by Puma, he removes the baffles from the clubfoot and makes it straight through - which is what the banana already is...