The solid state vibrator replacements are polarity sensitive so a person needs to know whether they radio set will be run as negative ground or positive ground and what voltage will be used. The units should be available for all contingencies.
This outfit advertises the 4-pin type if that's what it has. They should be plug & play but a person can make one if they have a mosfet transistor & a few other components.
https://www.radiosforoldcars.com/productsF.htm
There are likely other sources as well like the one posted previously.