ISO Newer Black Zon Sonus 4-string Bridge, 5 screws.

You may have more luck posting in the hardware section.

But, Babicz bridges are a good upgrade for those old Wilkinsons as they have the same footprint.

Babicz Full Contact Hardware - FCH-4 bridge - Best Bass Gear

 

Does it have a peizo ?

My Bquad I’m pretty sure had the same bridge


I swapped mine for a hipshot kickass

 

This may work from Gotoh (who may also own Wilkinson now). There are many screw opening you may not even have to drill new ones. The string also sits rather than inserted through a hole, just like the Zon

https://g-gotoh.com/international/product/404sj.html

 

You'll have to stretch to "upgrade" from that bridge. It's got what so many are looking for - solid mounting (5 screw), adjustable string spacing, good intonation range...
What do you hope to improve?

 

I did it because the little piece that holds the ball broke and also the piezo was wonky

 

If that's the case I would just buy new grub screws and springs then. They're super cheap and easy to find.

 

But don't confuse the string-trough holes with the screw mounting holes. There are 5 mounting holes, four string-through holes.

 

I am not confused. I am aware of the bevel for screws.

 

I count 7 screw mounting holes, 5 in the back, 2 in the front.

 

Sorry, I didn't count the ones on the leading edge. 7 mounting holes, 4 string-through holes.