I have replaced a couple Sadowsky bridges now with this 18mm spacing one from Gotoh (Sadowsky actually used these for the 5-string basses way back before having his own made by Hipshot) -
BB-3465 Gotoh J510SJ-5 Quick Release 5-String Bass Bridge
For the Gotoh bridge, two of the screw holes line up, the two outer ones in the row of 4, the rest do not. I didn't notice any difference in sound after the bridge swap.
With that, Warwick will soon be offering replacement Sadowsky bridges if you can wait. They currently say available in 10 weeks, but that has fluctuated some for awhile now. So, I'm not sure if the current 10 week time is going to be entirely accurate.
Sadowsky Parts - Quick Release Bridge - 18 mm - 5 String