
There are narrow tremolos, but most of them have same width for mounting screw holes than the string spacing, so you can't install it in 56mm spaced tremolo without filling the holes and drilling new ones. But there are special models and WVCSB is one of them. It has 56mm mounting holes but 54mm string spacing.

WVCSB has odd alignment for string holes. They are not in straight line, but "intonation corrected" or something like that.

This is the only problem I had with installing. The pickguard was too tight for WVCSB, even the outside dimension was only about 1mm wider than the original 73mm. The picture also shows that the front side was too tight (noticed that after cutting off the sides).

I used a red marker to show where to cut off. I didn't remove the pickguard completely, so I had to work with wires attached. It went quite fine, I didn't scratch anything or cut off any wires.

I used a sharp knife to cut off the pickguard, but it's a method I don't encourage to use. The knife easily slips and it will do that so you need to be careful where it will go after that. Here is the result after filing and sanding.

It's obvious that 54mm is the proper string spacing for this guitar. The pole piece alignment is now exact and the outer strings have exactly the same distance from the edge of fretboard as in the nut.

I'm using only two tremolo springs with 10-46 strings, so the tremolo has quite an angle. This will improve the tuning stability of vintage style tremolos.
It took about hour or two (including breaks) to install the tremolo because the pickguard issue, but it was worth it. WVCSB has a nice quality at decent cost and it even has a pop-in tremolo arm with adjustable stiffness. It's surely an improvement to old school screw-in tremolo arm.